Open source, self hosted. Has the nice bells and whistles like browser and mobile plugins.

free for personal use, open source, cloud synced, no device limits. and as OP mentioned different server implementations if you want to host it yourself. No idea why people stick to any of the proprietary solutions.

You have no idea why people don’t want to self-host a service? Or don’t have the knowledge to do it (securely)?

You don't need to with Bitwarden, you can if you want to. Like Lastpass by default Bitwarden store and syncs your passwords online.

I would prefer to not self-host as none of my family (who rely on passwords) are technical, and if anything should happen to me, they would be stuck.

Fully end to end encrypted. The other side to that is there is no account recovery.