you’ve just defined a steering measure…
no it's a price comparison.
you decide how popular your app will be and pick what you want to do.
steering would be Apple putting an Apple Music ad in Spotify and saying "you can buy this music streamer for $1 less".
Steering would be unfair use of your platform to capture a competitors clients.
When Apple Music and Spotify cost the same (one bought thru the app store, one bought outside) with no reference to the other, it's a consumer choice.
Say I want to convert some short videos on my phone.
I do a Search, up pops a few, I look at them, read blurb and reviews, and decide what to buy.
Sometimes the cheapest one, sometimes not.
Based on what appeals to me.
Apple Music appeals to some people (who like better audio quality), some hate the interface.
Spotify has some great playlist recommendations, some hate their whinging and use of the EU.
It's not some Jedi mind trick to get you to buy stuff.
You have a choice.
And it's not that freaking hard to buy a sub outside the app store and sign in.
You dont need a MENSA membership to do it. As millions of customers have shown.
