Im not if’s related,
But if you use 3g/4g mobile net, alle trafick runs over a transparent poxy.(router can do the same)
This proxy is use to block “virus” (after som time) or any other programs that sends requst the same info over long periods. This is done to keep the trafick down for the use that pay pr Mbytes off data.
The isp use this to block botnet’s from geting to report back, and avoid ther users from be used in a ddos atack.