I don’t know about render.com, but as long you have a HTTPS domain, you can just use any domain.
Also, I think many services will notify you about changes of their pricing, so you can just back up the server and move them somewhere before something going up.
Some good info about Vaultwarden is in the wiki, including some installation source, there are docker, binaries, and rust, so you can pick one of them.
I don’t know about render.com, but as long you have a HTTPS domain, you can just use any domain.
Also, I think many services will notify you about changes of their pricing, so you can just back up the server and move them somewhere before something going up.
Some good info about Vaultwarden is in the wiki, including some installation source, there are docker, binaries, and rust, so you can pick one of them.