I had to look it up myself. These two links seem to cover the controversy pretty well.
https://www.pcgamer.com/the-recent-criticism-of-linus-tech-tips-explained/
https://fandomwire.com/the-linus-tech-tips/
Edit:
Found this one too which is straight from the horse’s mouth: https://threadreaderapp.com/thread/1691693740254228741.html
This happens with my left hand but I can make a ‘normal’ three with my right hand.