I don't think it works like that. I can't just write "By reading this comment, you have agreed to pay me $100." and expect that to be legally enforceable unless you explicitly agreed to a contract to that effect in advance before reading the comment.

I could write "If you don't agree to pay me $100, I reserve the right to block your future access to my comments." (Which is what a ToS is.) But that's not a license agreement.