I’m pretty sure Bitwarden is profitable, about a year ago they even purchased another company: https://bitwarden.com/blog/bitwarden-extends-passwordless-leadership-with-acquisition/
Also, I don’t think they make that much money from individuals. They focus more on businesses, because they pay more and these customers stay around for a long time, they can’t easily switch to a different solution.
Nextcloud Notes is pretty good. Btw Joplin has an option for End-to-end encryption.