343
Unity has changed its pricing model, and game developers are pissed off
(www.theverge.com)
This is a most excellent place for technology news and articles.
According to the article, it's not retroactively charged, but still bad if your game is about to come out and you haven't accounted for this.
https://www.eurogamer.net/unity-reveals-plans-to-charge-per-game-install-drawing-criticism-from-development-community
Other articles I have been reading on the topic do mention it:
When I say that it applies retroactively, I mean that it applies to games released in the past.
It's true that they are not retroactively charging devs for past downloads. That would have been even worse.