I don't know about flighting GPL.
From what I have read it may be possible for GPL to be removed, if the copyright holders all agree, or if all copyright holders don't agree, then the code that is copyright those people need to be removed.
https://softwareengineering.stackexchan ... sed-source
Albeit this is stack overflow and not some legal adjudication
I'm pretty sure when KC7RBW first raised his copyright on the firmware, I thought that all of his submissions were so old that they had been superseded and rewritten, because he had not contributed since August 2020, and in the process of some big overhauls of the code, mainly undertaken by Daniel, a lot of the code got written.
And from what I can remember, he agreed that if all his code has been rewritten and superseded than he didnt have a claim of copyright to enforce the GPL
But when I analysed the current code, and checked whethr there was still items from KC7RBW I could see that he had a valid copyright claim.
I already posted this somewhere that I was incorrect in my initial ascertion that his code had been superseded
Additionally, if the code already falls foul of GPL, e.g. because of conflicting licenses or the elephant in the room of the 30% of the binary hack from the official firmware, was it every really GPL.
I"ve no idea.
I'm pretty sure attaching a GPL license to someone elses code (or binary) does not make that code GPL, and but other individual files will be GPL if they the GPL header.
Huge grey area.
I'd however be interested to know if it was possible to remove GPL and still remain as something I think gets called "Source available" - though this seems a vague term, and is not often used.
or perhaps creative commons..
Again I have no idea.
Removal of GPL from one version, does not mean discontinuation on a GPL version if people thing they are willing to work on the old GPL version
This is what has happened to various Linux distributions, which became closed source commercial
In this case the proposal was not commercial or closed source, its has to be non-commerical, and if possible "source available" or something similar.
But I seriously doubt, considering KC7RBW has not contributed since Aug 2020, and has said he will not maintain it, that you will find any skilled devs to take it over. All the Italian devs are already on their OpenRTX project "inspired" by the OpenGD77 and I would have thought are now unlikely to want to take over a project with a dodgy license.