There's no way of knowing what happened there.

But back in the mid to late 2000's we had a whole bunch of residential internet customers and every so often one would blow their traffic cap by a bunch and would ring up and say "Your billing system is wrong!".

Then whoever could be bothered in the office would do some modest analysis on their netflow data and come up with something like "18% of your traffic this month was redtube.com, 33% was pornhub.com and 9% was xhamster.com.

We never knew if whoever was on the phone was the raging porn addict or it was one of their associates. Either way they would say "Oh well, I guess we will never know then. Thanks for your help. Bye.". Followed by them quietly paying the bill.