The situation changed from one where there was some minor competition to one where there was no competition whatsoever
Oh really? So then, if I order a Vitrolix RF 85 from B&H right now, I won't receive a third party AF lens? Even if they do cease production, I could still purchase that one or a Samyang used.
Additionally, if that were true, then I couldn't have just ordered a Sigma 12-24 last week for my R6, because I like that better than any of Canon's UWA zoom offerings in RF so far. Again, Sigma, not Canon, got my money on a NEW autofocus lens for an RF camera.
Canon has a monopoly
Not really. Your argument seems to be that they WILL have a monopoly after they have driven out every third party lens manufacturer with legal threats. But that remains to be seen and so far I've also seen insufficient evidence to conclude that is Canon's intention.
And that's not even considering that you are only using the term monopoly to refer to one's options for fitting lenses to Canon bodies. Canon does not have any illegally acquired market position such that you have to use a Canon body, which is what the actual term monopoly indicates. As I've also indicated, even using your own definition that fails as there are multiple options for utilizing third party AF lenses on Canon RF bodies.