If I understand correctly, Unity got bought out by a company that makes malware, and these decisions have been made by a former EA guy. Truly a match made in hell.
"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. "
Either way they appear to be trying corral devs into using their advertising software. LevelPlay is IronSouce.
Combine this with their Gaming services. And they would control your backend. They would get a share of ad revenue directly, because it's their ad network.
At that point (this is just my opinion) you're just sort of their employee but without the benefits.
And it's exactly why I'm so adamant about some proper security (mental security) with whatever I develop, as well as the environment. Ownership is ideal but I'm not necessarily saying "Open source or GTFO". Just some reassurance that stuff I use or stuff I make can't suddenly be hoisted up by some middleware company and taxed out the wazoo.
I already don't like how I have to keep coming back to Windows for various tooling in my work.