I will never - ever use Shopify again. To extract 20% from a vendor of physical goods is criminal. BTW, I buy zero Apple products either - I will not take part in highway robbery...
As others have mentioned, this post is about Shopify apps, not Shopify stores. I'd recommend doing a bit more research before deciding to boycott a company. They're absolutely not taking a 20% cut from sales of physical goods, this isn't Uber Eats.