Sorry but no.
What mechanism was “Hey” using that could possibly be abused by a malicious app or malicious app author?
If “Hey” advertised themselves as B2B without any self-service option then Apple, by their own words, would have let the app on the store. Being B2C or having self-service (even if the self-service is outside of the app!) means Apple requires you to have a sign-up form in the app - and if you take punters’ money then that means you need to use IAP and so give Apple their 30% rent. The outrage isn’t over this requirement itself, but because Apple arbitrarily carved-out undocumented exceptions for Netflix, Amazon Kindle, and other “reader” apps even though they’re B2C and self-service - which we can tell is because Apple would get into a worse spat and lose public opinion if they tried to pull Netflix or Amazon’s apps for the same reason.
Netflix, Kindle and others are exempted from the self-service sign-up requirement because Apple knows they can’t win a PR fight against them. Spotify has self-service sign-up in the app, but that’s because they’ve always had a free tier, where’s there’s no free/gratis membership tier for Netflix or Kindle.
If you try it yourself right now Apple will require you to have a self-service signup flow in your app, which is only viable if you have a free tier - otherwise you’ll have to pay the 30% rent or let your iOS users use your service for free indefinitely because you can’t put up a “your free trial has ended” message.
Don’t accept the bullshit Apple offers for the App Store. It has always been about the benjamins, and to over a trillion dollars of success.
Apps can be used for fraud in ways that video cannot.
It's just some code you got off the internet and run on your phone
That’s the question you replied to without answering before.
Hey was able to alter their app trivially to comply with the guidelines, so it actually represents nothing at all here.
xCloud can’t be altered to comply, but nevertheless if app steaming were allowed in general, all of App review could be bypassed by bad actors.