There are second-order effects of Google or Apple removing Twitter from their stores.
Guess who's the bestie of Twitter's owner? Any clues? Could that be a vindictive old man with unlimited power and no checks and balances to temper his tantrums?
Of course they both WANT Twitter the fuck out of the store, but there are very very powerful people addicted to the app and what they can do with it.
That further proves my point that they are monopolies that cannot survive without protectionist intervention.