I agree, and it's a shame that bad apples make the whole ecosystem more toxic than it needs to be. I don't think there's a fix either, because there will likely always be a model for "amazing tech demo" that then fizzles out. It's like the VN equivalent to a pump and dump crypto scam. And some devs, like the one for WVM, start strong but then get so lost in their own process that they render their game virtually impossible to finish or keep at a certain level of quality and it just loses more and more steam.
I think consumers have to be ready to jump off the ship quickly and be way more cautious about what they jump onto in the first place. But that really sucks for a dev that has a vision and talent but is trying to make the money to justify it. Just unfortunate all the way around.
I feel like a good indicator of future success is looking at devs like the one making X-Change Life - the dev posts a lot, is constantly making new material, but also has a fanbase of mod makers and interactive fans that create an atmosphere of momentum. If the dev you want to support is just a dude with a PC telling you about his plans, I don't think he's doomed to fail, but he's definitely not benefiting from the accountability ecosystem of positive fans trying to grow his idea. That being said, this decline can happen to any game - look at how Summertime Saga has ground to practically a total halt over the last couple years.