I mean are you really going to be upset that one multi-billion dollar corporation is getting a share of the revenue of other multi-billion dollar corporations? Should we be upset that Amazon sells Apple products on Amazon.com?

Or do you think Apple and others should just not create features like this or make it easier for you to switch carriers in different countries when the carriers themselves are making billions ripping you off with overpriced throw-away SIM cards?

Ultimately if they're developing features like this, I don't care if they do or don't get a cut. My life gets a lot better. If (to use the US as an example) Verizon makes a little less money because they're paying Apple. Whatever. Could not care less.

Apple will probably eventually launch their own service anyway unless anti-trust breaks them up. iPhone is so huge that they can truly own the full stack if they so desire.