

Like most any paid VPN service they need to track bandwidth usage somewhat. They can’t see what you’re accessing but they can see how much of whatever it is. Windscribe also offers a free 10gb/mo plan so they do track it for that purpose as well, much like any VPN with a free tier would.
It’s probably pretty obvious when terabytes of upload are accrued over a few days like what OP mentioned, by seeding 24/7.