That's sad. I wonder why this happens.
Could be numerous reasons, IRL things, writers block or doesn't share same passion for the project anymore compared to the beginning.
Some people who mainly do it for the money also like to milk as much as possible because they know the money tap stops if the project is finished so they prevent it from finishing too fast. Sometimes they add different side projects to stay relevant and blame not working on the main project by spending time on these side projects and stretching the money tap period.
But no one forces anyone to subscribe or pay, you can literally just forget about this game for a while, wait until v1.0 and then buy it instead...but as most of these developers know, lust is a hell of a drug
Also some people claim the supporters who are being milked should stop paying because if a lot of them do then it might give a wake up call to the dev but it could also just make the dev tag the project as [Abandoned] and we don't want that either.