You have probably seen some porn videos that have been watermarked or named we me at slip.cc ?
Well, slip.cc is just a domain that is used for lead generation. That means that when someone types in that domain URL they land on a page that says, click here for ‘dating offer’ or ‘cams offer’ for example.
Currently they are just promoting a dating offer from Crakrevenue. This means that when someone clicks on the link on the landing page and then signs up to the offer, the domain owner makes money from this by way of affiliate commissions. Given how well slip.cc has been marketed online we can assume they make quite a large amount of money from doing this.