It honestly doesn't matter. This is the least of their worries. Stable Diffusion is going to put them out of business within a few years.
I could certainly build the replacement product if I wanted to.
Hosting videos at scale is an easy problem these days. Pornhub solves the niche and hard problems of handling user uploads, transcoding from a variety of upload types, content recognition, validating legality, and search over poorly defined user metadata.
A new entrant could centrally generate a human millennia of videos and richly tag them by every searchable dimension.
Pornhub won't exist in ten years because the entire need for that type of software will be reduced to near zero.
A new startup with less baggage will generate images and video at scale and destroy them. No user uploads, no legal issues, no infrastructural problems of scale for transcoding and caching arbitrary uploads, doing safety checks, etc.