nothing sudden about Patreons policies at all, it is in fact not a policy change at all for Patreon.. they just finally caught up and started enforcing thier policies. different story for itch.io though, this absolutely is a new policy for them.
some of us have been trying to warn you for years, and many of us withdrew our support for patreon long ago for this very reason..
you know all those posts on this website where ppl say stuff like "do you have another way of purchasing the game, cos i wont use patreon", or how almost every other developer now has a subscribestar account (they dont have the power to resist these changes) as an attempt at a solution?
being ignorant and calling others paranoid conspiracy theorists makes you #PartOfTheProblem ..
of course it doesnt help that itch.io are a bunch of cowards who didn't stand up to the leftwing extremists who run patreon, stripe and paypal at all. they'll happily take yr money for years, but wont lift a finger to help when its crunch time.
eventually the same will happen to steam, cos no one acted when we had time to act. ya'll happily trotted over to patreon and kept handing over money