That license does nothing.
Your comments aren’t licensed because you put something in them. It’s stopping nothing. Licensing is an agreement, and requires parties to consent. You don’t just magically force licenses onto people.
If this was real I could license my comments where if you read them, you owe me 10k.
This is the digital equivalent of sovereign citizens.
You agreed to the ToS given by the library.
Hence why you have to get a library card to check out a book.