Originally Posted by beavr

It's really easy to estimate with with just a few companies making 70% of the market like:

Mindgeek with tubes, TrafficJunky and paysites
Streamate WL network + affiliated groups
Xvideos and the rest of the Group
Xhamster with Stripchat and TrafficStars
OnlyFans/MFC
Chaturbate
LiveJasmin

There are some few big local players in local markets as well, especially in Japan, UK, Germany, France.