It's meaningless bullshit if they think the AI companies give a shit about copyright
Even moreso: When you post online you typically give the website a license to distribute the content in the terms and conditions. That's all the license they need, it doesn't matter what you say in the comments.
Because when whatever company gets a data breach I don't want my data in the list.
With bitwarden If your server goes down then all your devices still have a local copy of your database you just can't add new passwords until the server is back up.