Here's the DPReview article: https://www.dpreview.com/news/....3875526045/viltrox-r
I recorded this over the weekend and reached out to our Canon rep for comment, of course. He got back to me and I added his response into the video after recording.

In short: Canon seems to be using their patents to block third parties from making lenses for the mirrorless RF mount. It's not uncommon for tech companies to do this; Apple does it so they can charge third parties to connect to their infrastructure. However, I think this is huge problem for Canon users because Chelsea & I built our careers on less expensive third party lenses... and that's true for hundreds of photographers I've known who built their careers using third-party lenses because they simply couldn't afford the expensive L lenses.

The fact is, it's not too late. Canon can listen, so please write a comment sharing your feelings and your experiences using third-party lenses. Contact Canon on social media and let them know what you think and how this impacts your feelings on the RF mount.