@mangeurdenuage @zero No, I'm pretty sure you cannot revoke a public license, most licences explicitly mention this but I don't think it's required.

And with full rights ownership you can change the license at any time, regardless of whatever license the project is using, in fact the GPLv2→GPLv3 of GNU software hinges on this via copyright assignment to the FSF.

The only way to prevent things like arbitrary relicensing is to have a large community of contributors who never assigned copyright (which is part of why I don't sign CLAs).
Or well do a fork prior to the relicensing, because public licensing.