The OP is about Librem Tunnel, an app which is one part of a subscription service called "Librem One".
By forcing this company to add in-app purchases, Apple is taking 30% of all the revenue of the entire Librem One subscription, since Librem doesn't sell VPN access by itself.
I don't see how I'm blowing that out of proportion? The kiosk taking 30% of iCloud subscriptions is pretty much a perfect analogy to what's going on. I haven't exaggerated anything as far as I can tell.