Authelia is an authentification provider. So you can have a single login for all your services. It can provide autorisation and authentification with a single unified login.

Bitwarden is much “simpler”, in it’s just a passwordmanager. As soon as you start sharing passwords, like you do in bitwarden, you lose the authentification part, even worse, you lose control over the shared login. Anyone with autorisation can “steal” the login as in unauthorized copying/distributing the password or even changing the password alltogether.

With an sso like authelia you can mitigate such attack vectors.

Quick heads up, Nextcloud works perfectly fine behind an auth provider. I am using it behind authentik.

Are you serious? Instead of doubling down on your ignorancy by asking rhetorical questions you could also try to inform yourself. The answer to your question is in OP’s post:

The children in these photos/videos can’t make pornography, they’re sexually abused into making this material. CP insinuates that it’s legitimate porn with children. CSAM, on the other hand, calls it what it is: sexual abuse of children.

Well I didn’t say it fixes the problem. I’m just saying you’re ignoring it. By ignoring the issue, you’re empowering the issue. Which is definitely worse than not doing anything. So your opinion is wrong and ill-educated.

Just because you aren’t affected doesn’t mean it is no problem. This isn’t needlessly pedantic, it just shows your ignorance and idiocy.