I hope this does not fall on deafs ears but I am experiencing this EXACT thing with OVH(Canada's Mega Datacentre).
I have compared speeds directly to OVH's servers, and indirectly through a reverse proxy, and AT&T throttles direct connections to OVH. When I prompted OVH about it they confirmed to me that AT&T requested that they pay them for priority bandwidth and they refused (as is their right) and now my customers get throttled to 200 kb/s when accessing my servers on OVH.
PS. OVH has arguably the largest data center in North America so this means a lot of services are being affected by these ISP's.
This may be a bit unrelated, but OVH provides a publicly accessible weather map of their network (something I wish more ISPs/providers did): http://weathermap.ovh.net/
I have compared speeds directly to OVH's servers, and indirectly through a reverse proxy, and AT&T throttles direct connections to OVH. When I prompted OVH about it they confirmed to me that AT&T requested that they pay them for priority bandwidth and they refused (as is their right) and now my customers get throttled to 200 kb/s when accessing my servers on OVH.
PS. OVH has arguably the largest data center in North America so this means a lot of services are being affected by these ISP's.