Maybe they could take the AltStore path but afaik it comes with certain limitations. You are only allowed to install X amount of apps and if I‘m not mistaken the apps „expire“ after seven days or so and you cannot use them anymore. You will have to go to your computer and refresh them manually. You could possibly setup a virtual private network or so but yes, by and large, it‘s a pain in the ass. The closed ecosystem with the centralized app store is a huge problem and one of the reasons why my everyday device is an Android. Being dependent on just one appstore sucks. Take Phoenix Wallet as a recent example. Android users couldn’t care less. Nothing changes for them. 

 *and tbf, the Phoenix case wasn’t even a matter of Apple censorship but technically it doesn’t make any difference 

 I think there’s two official ways of going about this:
1. Publish an alternative app marketplace in the European Union under Apple’s draconian rules. https://developer.apple.com/documentation/appdistribution/creating-an-alternative-app-marketplace/
2. Make @Zapstore also a web client and have the download links go to the official App Store or TestFlight. 

 Yeah, been looking at the altstore approach (essentially self-signing apps). Far from ideal but it would work

And an alternative EU app store, later down the line.