There is actually a really interesting story behind this that was once on HN, I unfortunately can't find it anymore but it has something to do with the following process:

1. New content creator enters market. 2. Content gets uploaded to tube sites constantly, take-downs are intentionally slow and ineffective to make this process as tiresome and inefficient as possible. 3. New creator is eventually forced to upload the content themselves in order to generate leads and collect some revenue although this is very little. 4. This revenue is not and was never planned to be enough for the creator, two options: A. Quality of content and models is reduced in order to reduce costs and remain profitable. B. This does not happen, studio struggles to stay afloat and is forced to sell, it gets acquired by guess who... the parent company of the tube site.

I probably got some things wrong so feel free to correct me!