I used a seedbox some time ago to download a specific big torrent (at the time). I payed using Paypal, as I don’t consider seedboxes a low-hanging-fruit for rightsholders to persecute at the moment.
There’s too much redundant data on these services, so if they takedown one user’s data, there’s still lots of the same torrented data on other user’s. I don’t think rightsholders are willing to play wack-a-mole for such infractions.
They’d rather invest their resources on more centralized file sharing, such as big public torrent sites and cyberlockers.