The first comment of this FAQ thread is also talking about this. https://forum.unity.com/threads/unity-plan-pricing-and-packa... The FAQ is worth reading on its own (and very hard to believe as a Unity game dev, honestly, WTF).
"Q: If a user reinstalls/redownloads a game / changes their hardware, will that count as multiple installs? A: Yes. The creator will need to pay for all future installs. The reason is that Unity doesn’t receive end-player information, just aggregate data." Bonkers edit?: Am i reading it right that they want to retroactively charge developers extra fees for previous installs? I think this text i am quoting below is wh…
"Q: If a user reinstalls/redownloads a game / changes their hardware, will that count as multiple installs? A: We are not going to charge a fee for reinstalls. The spirit of this program is and has always been to charge for the first install and we have no desire to charge for the same person doing ongoing installs. (Updated, Sep 13)"