From my understanding, the original turd that began soliciting donations for uBlock was made an offer to sell the Github repo to the turds behind AdBlock. And what you're seeing here is a clear demonstration of that group's very poor understanding of the law.

Thank you for explaining. Would you happen to know if he is still involved with the project (as an employee or something)?

That I do not know, sorry. While he is not a good programmer (judging from what little is available on his Github), the AdBlock rent-seekers do not seem to have technical skills (judging from the way they do things). So I could see a justification for either case.