There is a lot of 4K content on private torrent trackers. Most of it is freeleech on well-known trackers, even basic ones. The best part is that almost all content remains well-seeded. The main requirement, however, is maintaining ratio requirements and following basic download rules on these trackers.
A seedbox is essentially a 24/7 torrent client that helps users maintain ratios, earn bonus points, and seed content on private trackers. It can usually be used with public trackers as well.
The process is simple: you download the torrent to the seedbox, then transfer it to your PC via FTP.
This method is cost-effective only if you regularly download large amounts of 4K content, as seedbox subscriptions require a monthly payment.