In reply to Jean-Baptiste.

Very cheap trick Mister Baptiste, very cheap trick.

Is WP Rocket GPL?
Yes.

The license information should be added in your T.O.S or Legal page page with link to the GPL license. I can't believe that you are running this plugin more than 2 years without mentioning licensing information, plus wptavern published multiple news about this plugin.

Maybe you never mentioned even in F.A.Q if someone didn't mentioned you?