I certainly think they do throttle in it some way. When my Xbox has been downloading a huge game most of the daytime it flies during the first few hours hovering around 4-5MB/s then reaches a point where it slows down to only 1MB/s and continues at that speed until I reboot my router.
Same can be said for torrenting too (If I'm allowed to utter the word here, I presume its like Voldemort). Once they deem you've had enough my client just stops downloading totally. Another reboot solves it for the most part, because you are assigned a different external IP address each time you reboot the router.
For me I find network contention to be the biggest issue, my connection is fast during most of the day time, but come 5pm on wards the speed drops by a half, and around 7-9pm I'm lucky to see 1MB/s.
Edited by buggerlugs (Thu 06-Feb-20 15:05:45)