I understand. Patreon and SubscribeStar are my only options right now, so I rely on them almost entirely for income. I know a lot of people want to buy a game once and be done with the transaction process, however there are no places I can currently sell some of my work. I'm truly sorry about this. It's something entirely out of my control.
A quick Google search brought up the process for cancelling a Patreon subscription. But yes, you have to pay again for every update. It's only a couple dollars, and you can always wait until a game is finished, then subscribe, grab the game, and cancel. Currently on my Patreon, you can get three complete games for $3. It's an absolute steal.
This is just the world we live in right now. Companies are going to tell you what you're allowed to enjoy. All we can do is fight the good fight and push back however we can.