Yes there'd be less, but the amount is purely speculative and you don't know anymore than I do.

Even if they have to go with the ad-supported model to maintain a large active userbase, that can easily be done without all the tracking. But again, they chose the shittiest option...there's really a pattern of them just being massive assholes. No matter what options they have, they'll apparently go for the shittiest one that screws over the users the most.