Downvotes are possibly because your comment could be read as instinctively/tribally anti Microsoft.

Yes, MS and Apple are competitors. But what would they have to gain by shutting-down iOS support? People would just move to TestFlight (Apple owned), which would gain MS noting at all and probably earn them some justifiable bad feeling.

Nadela-era Microsoft is looking to be a different and more open beast than the Gates and Balmer era company.

Edit: I didn't downvote you.