Once people know where that is they will remove it and continue install-bombing.
This opens Pandora's box... how do you prove a person installed a game on a device at least once? Fresh windows install, is that a new device? In a Virtual Machine, is that a new device? How do you identify a user as the same person? It goes on and on...
I don't know about twitter but it is common for the API to also be powering the front end regular user's interact with. No matter what it's stupid to rate limit this heavily.
The market may be crowded but this one finds a very specific niche blend of mechanics that a lot of shooters don't get quite right. Also you can play it on a potato
Why did you put inflation in quotes like it isn't real?
https://www.rateinflation.com/inflation-rate/usa-inflation-rate/
At $35 right now the game is reasonably priced for the amount of value you will get out of it. I believe there is an expansion on the way as well...
Wall Street is probably hoping Unity gets away with it.