Maybe something like Patreon

Well we do have Liberapay. It's not perfect in that it only addresses the payment angle (with the issue around processors noted by the other reply still present), and doesn't allow for subscriber only content, but it's something.

I think between something like this and a few other things (dunno much about PeerTube etc. or if 'private' posts are a thing where you could maintain a 'mailing list' of donor accounts and grant them access to exclusive stuff), it's possible to cobble something together. Lot of management would be required in the backend compared to more mainstream approaches at this point, though.

Just thinking outloud, there's probably stuff I'm not considering here. Re: an eStore...idk, only thing I can think of is a DIY webstore relying on emails and money transfer services if trying to avoid mainstream eCommerce stuff like Shopify or whatever (same way people used to sell pot on the clearweb back in the very early days, lol).

You would still need a payment processor, which takes a huge chunk of the cake in fees.