There were 2 Australian sparrers named Meryl and Renee who were very infamous for their delay
I also believe Macen had some pretty terrible delay, the UTC where he beat Ares in the finals was hilarious

I got stuck with satellite internet for a year over some dispute between providers in my area and I delayed, it was not enjoyable but I made the most of it

PC Graal did not have the same international appeal so it wasn't extremely common, there were modem tappers and UDPers though
There was an option you could tick or untick in your settings that let you toggle between using TCP or UDP as the way to handle data on Graal, people would play with that option and it'd basically emulate delay