Well I'm not a WnakTube submitter, but, as you know LB, I have to stick my nose in everything, so here are my uninformed suggestions.
Have a small fee submitter account for porn webmasters.
Use a script to filter the content owned by sponsors who ask for exclusion.
Have a forum for amateurs to discuss their submissions and those of others, and make free submissions dependant on forum involvement.
Set a max of 1 submission per day for non-partner members.