So tracking installs and distinguishing between pirated and legit copies, and fingerprinting consumer hardware, and dealing with malicious or troll installs is going to be something they're somehow better at?

I can't prove Unity's motivations, but I can quote directly from their article:

> Qualifying customers may be eligible for credits toward the Unity Runtime Fee based on the adoption of Unity services beyond the Editor, such as Unity Gaming Services or Unity LevelPlay mediation for mobile ad-supported games. This program enables deeper partnership with Unity to succeed across the entire game lifecycle. Please reach out to your account manager to learn more.

and I think it's reasonable to at least entertain that it's not enforcement trouble that's causing them to create this policy. Not for the least reason being that they still have a revenue requirement sitting in front of this policy, and they still need to engage in the exact same accounting and fights to figure out which companies have made $200,000 so they can start charging them per-install.

So now they are charging developers for something users have an incentive to try to do without paying the developer.

I'd be open to more clarification if there's something I'm missing, but I still don't think this is comparable to app store fees.