All crowdfunding services for "support open-source" for some reason wants people to pay crazy fees like 10% of the payout.
So, I've implemented my own one:― Simple;― Zero-fee;― Self-hosted;― Multiple cryptocurrencies in the future (you can help!).
@jeffcliff, yes, initial implementation support only GitHub, but there are plans to support others.
Feel free to help with it.
lor.sh is yet another mastodon instance.