Donations.

I don’t find subscriptions too offensive, however any kind of restriction of the flow of information (e.g. by paywalling it) implies its enforcement. What are you going to do about people bypassing the paywall? Even if you only responded by patching whatever allowed them to bypass the paywall, you’re either going to have to let up eventually, or get into a protracted cat-and-mouse game with paywall bypassers. And you don’t want to end up on the side of the people who want to gatekeep information.

So that leaves us with the possibility of having a subscription that’s not stringently enforced—in which case it is just a recurring donation anyway.