You mean the password manager as the central authority? You can self host a password manager using, eg, Vaultwarden.

Even if you use a trusted, paid commercial service, I think the risk of that happening is lower than on Reddit. Their business model is simpler and more transparent. They want to keep you as a customer so you will keep paying them. And there is less opportunity for them to ban you for political reasons when you’re not expressing yourself on their platform.