I dont know if there are any adult content restrictions on these, but bountysource, opencollective, and issuehunt may be good options.
BountySource, for example, can do bounties and salts. Salts are recurring donations, and a bounty would be for a specific feature (new server, custom patches, patches to upstream, etc).
Might be a viable option so thought I’d mention.
The apps aren’t there yet for this.
https://browse.feddit.de/ is a good way to search through all communities across all instances though. I’d search there, subscribe in the browser, then you’ll see it in your app (with a refresh obviously).
It will get easier as time goes on and lemmy (and the apps for it) get more developed.
That’s a wild take for ‘Message an admin when there is a problem with a mod, here are ways you can reach us’.