Anyone who's ever pledged $10 or more gets Crisis Point at no extra cost once it comes out, which is much lower than the final price of the game will end up being. There's no need to continue pledging for the entire game's life cycle, unless you want to get every playable update; you can follow the development for free too, which is why I post development updates everywhere rather than behind a paywall.
Continuing to release every version of the game for free wouldn't make much sense when the final game will be sold, not free; that would mean the version before the final version is free, and there's very little point in buying the final game. I stopped releasing Patreon builds for free once I felt the public demo had enough content to decide if you want to buy the full game or not, and given that the public demo has over an hour of content, I'd say there's plenty of content to decide on that.
Other developers do what works for them, and I do what works for me. Thank you for following the project, but please don't feel obligated to stick around if you don't like how I do things!