On a quick scan, the "BITWARDEN LICENSE AGREEMENT" mentions
"Commercial Module License". So some sort of Opencore and, TBH, I'm too lazy to check out further the implications.
On the other hand bitwarden_rs is GPL-v3. Like it or not, at the very, it is very clear where it stands.
Interestingly, KeePassXC has multiple licences and take the time to neatly list what is under which.
