It will be somewhere in settings-> default app-> opening links
It will be somewhere in settings-> default app-> opening links
The atmosphere erosion is not really an issue. It take 100s of millions of year to erode the atmosphere so at humanity scale it's not really a problem.
How does it even know what is installed on your phone ?
It's a lower barrier to entry. It's much easier to get people/subreddit to join the protest if they know it's limited in time.
Then once they started the protest it's easier to extend it indefinitely.