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Some users have added
Everything I post on Stack Overflow is licensed to you under CC0
to their profiles. I would like to know whether this is legal, because as far as I know stack exchange uses CC4.0, and I am not sure whether or not it is legal to add that to my Profile.
It's not illegal to say things in your profile. SE requires you to license your content to them on a non-exclusive basis pursuant to CC BY-SA 4.0. "Non-exclusive" means that you can also license the material to others on some other basis, e.g. CC0. In that case, a person who uses your material can rely on the other license that you granted.
If SE wanted to, it could prohibit putting licenses in a user profile, in which case you would have to promulgate your more generous license elsewhere.
