[boris9999]

How is this a problem? Are all marketplaces bad? Were you forced to sell there?

You chose to sell your app on their marketplace and agreed to their TOS and pricing. They provide you with access to their marketplace and you agree to pay them 20%. Were you aware that these are the terms and broke them anyway?

It's like an Uber diver who will start charging cash without going through the Uber app to avoid paying Uber. Or maybe start a McDonald's franchise and hide all the profits. Not to mention paying taxes to the government...

Apple controls the iOS platform, so it's a different case. Shopify does not prevent you from selling on your own website and taking 100% of the profits.