You could also setup your own website, or simply get some payment methods set up and start e-whoring, as some call it, through other portals like facebook, instagram, etc.
If you are getting paid through a major cam portal, then they are using their own processing account for visa / mastercard, etc.
They are going to take a portion of the money for handling the transaction, and percentage to pay staff, and affiliate advertising in most cases.
The different ways of getting paid online all have their good sides and bad.
There are many options for getting money through a third party payment processor.
Most internet models are not getting cash, it’s simply not an option in most cases.