365
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.
Or a rival developer, troll, corporation, etc just runs a script to uninstall/reinstall someone else's game over and over and over again costing them an insane amount of money.
Why bother actually installing? Just use a packet sniffer to find the data being sent to Unity and replay it in a loop. You could probably hit somewhere in the range of 100k-1M "installs" per minute.