yeah; active unlimited terminology categories are:
(1) Grandfathered Unlimited: these are TRUE unlimited data plans in the ordinary sense of the word, but you can't buy them new, and the carriers are beginning to aggressively terminate high data users who have these
(2) Nasty Throttled and Network Managed Unlimited: ALL new "unlimited" smartphones and MOST carriers' hotspot unlimited plans have this; after X amount of GBs of tethered data, you get throttled to less than ADSL speeds
(3) AT&T, which, for HOTSPOTS ONLY, does NOT perform any throttling