TL;DR version: Let the developer make what they want to make and quit derailing the thread please.
The problem is that you don't understand how it works. Yes, you're ruining a lot of games, so it's normal for people to complain.-
- Develop games tailored to your preferences rather than sucking up to other people's games and complaining when that audience disapproves.
I will always find it dumb how some people just can't seem to understand game development nor respect the developers that make games for them. Companies that makes games for profit make their games to maximize their profits. They develop whatever the more likely to pay consumer is interested in, as that is what makes them the most money. This is mostly the case for companies, not normally the case for developers that aren't a company.
Solo devs or small passionate dev teams create their games for themselves based on their own interests, not because there is a market for it or because it will get them a lot of money. It is extremely rare that a developer will add something to their game they don't have an interest in, as doing so would ruin their vision, their dream, and ultimately THEIR game. Of course these developers still want money, which is why they post their games on places like Patreon and adjust the amount of each content/fetish based on their fans. This doesn't mean, however, that they only listen to what the majority of their audience wants and ignore what they themselves want. If a large amount of the audience wanted vore and the developer didn't have any interest in it, the only reason they would add it is if they only cared about the money and that isn't as common as you think. You say to "develop your own game tailored to your preferences" to those who enjoy the game's current content while also complaining about a developer doing just that instead of making the game tailored to the things you want.
When a game that initially focuses on feet starts to include urine, then scat, vore, giantess, cuckhold, and many others get added.
In the end, the vast majority of players end up with 10 to 20% of foot fetish content in a game that was initially sold as focusing on that, with the rest taken up by each “niche” community that has its own little scene with each update. So yes, we're right to complain. Not to mention that even within the foot fetish community, there are different preferences that are incompatible, for example those who like stockings and those who like socks. When you take one of the scenes for yourself, they all end up being much more affected.
You say this on a thread for a game that on its very first version included content that wasn't just feet. The dev never advertised the game as an only foot fetish game, instead as a "femdom themed game" with even in the Genre section listing farting. Currently, the game is exactly as advertised and as the developer intended it to be: a femdom themed game with a focus on feet while also having other fetishes like farting. You say that "we're right to complain" when your reasoning is a hypothetical that has not come to pass (the addition of tons of fetishes to the point that 20% or less of the content is the focus fetish), making your argument have about as much sustenance as saying the world will end tomorrow because there is always a chance it could. Even your argument of the preferences of the individual ring hollow when this is not only the case for pretty much every fetish (for example, some people like only farts and not scat, and even the opposite), but also the developer is the one tailoring those preferences to themselves. If the developer is more interested in stockings than socks, they will likely include more stocking focused scenes than sock ones. To reference once again what you say right after, "develop your own game tailored to your preferences" just puts more irony in your post as the developer chose how much of each content was added, whether that be stocking, sock, farting, or anything else. It is their choice in the end how much of each content gets added and what gets added, it does not matter if that means less content for those who only like feet, those who only like sock feet content, or those who only like farting.
If you look into pure foot fetish femdom games, you'll quickly realize that there aren't actually many of them
This could be said about any fetish that isn't vanilla. The amount of foot fetish games that include at least one other fetish far exceeds the amount of purely foot fetish games by probably 99%, yet this is the same for plenty of fetishes out there like farts, scat, giantess, vore, abdl, anal, facesitting, armpits, burps, handjobs, cunnilingus, ntr, ...I could go on forever. Finding a game that has JUST one fetish can feel like it is borderline impossible except for vanilla sex (of which I mean just sex, nothing else). This is because people are more likely to have more than one fetish if they have a fetish, and developers are people too.