Nothing about this general concept is appearing out of the blue. This is an extreme copycat business market that is never really going to attract people with legitimate skill in the creative writing department, or game budget plans that include a real desire to pay somebody extra for that type of invested effort. But don't think it's being lost on a lot of the more talented game devs out there, still stuck pushing out screw-your-whole-family baseline stories as backdrops to their great renders/animation products, when similar level quality devs/games are currently seeing a notable amount of alternative financial growth route success lately in pushing quick fix patches of different variety sex content into their games.
These advanced devs like Incenton make their living in meaningful data and hard facts. They aren't out there refusing to take the red pill that allows them to see that outside that matrix existence here created by super vocal people on **BOTH** sides of that extreme outlook spectrum, the spoon, or in this case "NTR" as some absolute defining line in a game's offered sex content people will pay for....doesn't actually exist in that outside reality where 95% of their financial support is typically coming from.
The people claiming "NTR" is widely popular with paying supporters right now are right in one respect. As evident by the fact that you can look at pretty much any semi-successful screw-your-whole-family game, and if it offered a latter in development patreon poll to add "NTR" sex content differing from what's already in the game, that will pretty much always win the poll and end up seeing an increase in patreon subs. Every single time, and regardless how many pages of contrary perception outrage feedback you'll see pile up here as a immediate aftermath result. The "why" that ends up happening though being chalked up to claims that "people love and specifically desire cuck content" is where those claims are wrong and purposely misleading.
Or basically and in a nutshell....expect to see a lot more good devs pushing out these "NTR" add on packs, bonus extras not tied in to main story, what ifs, ect ect. It's going to be a thing going forward, and it's going to be mostly NTR simply because that is the alternative screw your family stuff out there which they have to copycat with.