In what way does anyone have a monopoly on generated images and video? Last I checked there were several major players and more startups than you can shake a stick at.
You can make your argument validly against DALL•E or Midjourney families, but we've also got the Stable Diffusion family of models that anyone can just grab a copy of.
What does not remain to be seen though is that generative ai is going to put a lot of artists out of work.
You can argue about the good and bad of that but it’s defo happening.