In that case, how do you explain the dozens of apps that I can list personally that do require out of band subscriptions? This isn’t just major brands. One that comes to mind is ACloudGuru.
So you're actually proving the point that their review system is neither fair nor consistent with your crusade in here. Also don't forget about survivorship bias. For every app you see that does this thousands of others got forced to use IAP during the review process.
What’s more likely, your interpretation is wrong or reality?