LiberaPay itself is fine and I already have an account there but it's inactive. LiberaPay is basically just a frontend for PayPal and Stripe. PayPal is just an absolute trashfire, I think we can all agree on that. But Stripe does not seem trustworthy either. They're apparently an union-buster. Yeah ...
I used to accept Bitcoin but after only receiving 1 dono after 3 years worth 5 USD, and the sender even managed to somehow lose 45 USD due to "transaction fees" (??????), that wasn't really pleasant and showed me how out of touch with real-world usage Bitcoin actually is. And due to the proof-of-work nature literally destroying the enviroment and me coming to the opinion the Blockchain just kinda sucks I eventually made the decision to give up on cryptocurrency entirely. I also realized for the grand promise of Bitcoin to be true ("safe and reliable") I actually have to run a "full node" but this requires me to download hundeds of gigs only for the blockchain, i.e. litereally the entire freaking history of every Bitcoin transaction ever. The alternative is to just "trust the network". Yeah, right. I think Bitcoin is fascinating from a nerd / IT / theory perspective but when it comes to actually getting things done, or ethics, it all falls apart IMO.
I also dislike proof-of-stake because this is literally feudalism built into the protocol.
And due to the whole "web3" nonsense being a massive shitshow in general (see www.web3isgoinggreat.com/web1), I decided to distance myself from Crypto for the time being.
While many cryptos ARE compatible with FOSS, there is still so much else wrong with it for now. But I'm also not a super expert in this, there is so much crypto right now, it makes my head explode.
The biggest difficulty with crypto when you need to convert them to fiat currency (and I have to; the people that demand money from me only accept fiat, not crypto :D ) and all those weird currency swap websites make my head spin.
Oh, but I digress.
OpenCollective looks promising but there's a lot to read. I need to take a deeper look in it. At first glance, it doesn't seem to immediately disqualify itself, which seems nice.
And about the IBAN thing ... yeah, had the same idea, but I don't know if it's safe to do so because of privacy reasons. Yeah, I'm not risking randos from the Internet raiding my home for the chance to earn 5 USD every 3 years.
Anyway, thanks for the replies. It seems FOSS and finance are still kinda at odds with each other, with the notable exception of cryptocurrency but this has its own unique problems.