Not really, it’s just phrased differently to the usual signup pitch, they’re putting in a middle ground between full “premium” subscribers (whatever that is) and public access with tracking and ad metrics.
Companies need revenue to operate. They get that revenue from advertising data and selling ad slots, or subscriptions. Whether they actually cease all tracking and ad metrics when you subscribe is something I’d doubt though, and that could be a case for the legal system if they didn’t do what they claim.
Personally, this behaviour is the point where I would not consider the site to be valuable enough to bother with.
“I have no mouth and I must scream” could end up being a plausible way to spend eternity.