But it is impossible to bypass the store for any normal person.
Think about it, you are a normal person who wants to continue to use an application and for some reason the dev has been kicked out of the store (this often happens and the devs often have no idea why or how). You would be frustrated no?
Not to mention the mental stress of the poor devs which are subject to inhuman automated responses, neglect, and abuse by Apple/Google. Apple/Google is essentially shutting down small businesses arbitrarily and remorselessly. The only way action happens is if the dev somehow gets enough attention on sites like this that Apple is forced to act.
These tech monopolies have MORE than enough money for a customer/creator/dev service department - they just don't care, or, perhaps, maliciously use the lack of one to control their platform: "Oops sorry, you have been talking to our super-smart infallible AI, we don't know why its acting this way, but we are sure its right! You have one week to fix the issues - have a nice day!"