Do itch.io put copyright on games to avoid copy?

You probably mean copy protection. No, we don't do that.

Ok thanks

don’t web only games count as having copy protection? also unity has support for itch license validation, some games like tallowmere 2 have key-based access to multiplayer and some projects like 3dSen use itch only as a key seller for steam. maybe forgetting a few cases of copy protection on itch