Hi,
As far as I'm concerned, everything works smoothly. I keep on winning mor than 40 USD /per day. But I don't have any adult content.
For sure I think it's completely forbbiden in their in terms to post and share adult content.
More over, my payments are always received the day after my request.
You can contact the support for further informations.
I love Mixturecloud, it's very easy and I paid quickly.