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Concerns Raised Over Bitwarden Moving Further Away From Open-Source
(www.phoronix.com)
This is a most excellent place for technology news and articles.
Don't forget option 3: someone writes a vaultwarden client independent of the closed-source crap.
If you can write a server that fully supports the client via the documented API, then you know everything you'd need to do to make a client as well.
That’s not a third option in the same list (things they are going to do), it’s an item in an entirely different list (foss responses to their actions).