I mean, I believe that it's possible you're correct. But this is just such a foreign "does not compute" situation to me. Is the thought process something like "Sonarr is often used to download things against copyright law -> that's a no-no -> we don't do no-no's here"? I'm trying to phrase this as positively as I can, so I apologize if it sounds like I'm belittling the mindset or something. It's not like that.
(It's mildly unfair to Microsoft to imply that this could be the reason, since as a company policy Microsoft can't show up and say "Well actually, the reason we didn't hire was because X" – and this seems like it would be an outstandingly bad decision. Old Microsoft may have made decisions like this, but in recent years they've made some pretty impressive reforms.)
Anything mentioning or using BitTorrent is scary for these huge companies, because it's associated with piracy.
Sure, your deploy times to your container fleet can be 70% faster, but if you're using BitTorrent, it'll be very hard to push that through leadership.
You may or may not think that's a fine thing to do, but it is the only thing you can pretend Sonarr is for.