Vaultwarden, self-hosted is free as well. And since it’s not using the Bitwarden infrastructure, you’re only as exposed as your own network anyway.

But you can still use all the standard Bitwarden apps and extensions on any device, you just need to point it at your server. Easy to set up for friends and family as well. No need to try and teach them about VPNs, setting up syncthing, etc.