Sure, I use BitTorrent for Linux isos at work in a highly controlled environment, but for every one of me there would be hundreds pirating software at work, and tens accidentally killing their businesses bandwidth/quota by seeding too much.
You’re welcome to disable it via group policy if you like.
Defender enabled by default would save billions annually, and not just from businesses but also grandma who’s entire photo collection just got ransomware’d.
That big daddy policing move was the single best action taken by Microsoft.