There are legitimate reasons to dislike the man but it's so obvious that the mob is just grumpy that Musk allowed criticisms of the Democratic party line to exist on Twitter.
Your password store is a single file, it can be encrypted, backed up (or not), distributed/synchronized between your devices (or not). It belongs to you, not to a third party.
The inevitable rejoinder is, "what happens if someone gets that file?" Well, what happens if someone gets your piece of paper?