The main issue is that people hope to make money by going into hyper early access. Early access is great when a game is at least in alpha stage, as it allows the developer to react to customer feedback before the game ships. There are lots of examples for EA done right in the general gaming market. Usually, it's fairly easy to spot the scams.
I mean, why on earth would you start a Patreon if your game has a version number like 0.001. What's the point? If the demo is more like a proof of concept, it's fine, but releasing buggy and incomplete software should not be rewarded with money. The worst offenders are games with Patreon "paywalls". Just... why? Stop being greedy, you're not ActivisionBlizzard. Put out quality first. People love rewarding quality - just look at games like Pale Carnations or Fetish Locator.
If you say that you need the money for development, you've got to have a clear plan. So many games are just meandering endlessly, because it's the best way to milk supporters. Of course, it's also the fault of the backers. Personally, I wouldn't pay for promises. I only back projects on Patreon which already have a lot of content and look like they're going to be finished.
Last point: Porn games are still in their wild west stage, at least outside of Japan. People see a thriving market and want to participate, which is completely understandable. If you look at gaming history, we've had developments like this before. The crash is bound to happen. Maybe not this year, maybe not the next. But the hyper early acccess bubble will implode at some point.
