Brazil is particular in that and other related things.

For example many MMORPGs have Brazil-only servers, because brazillians tend to hack, cheat and troll, so many games have ip-banned the entire Brazil range and then made a server just for Brazillians.

When website defacing was all the rage, Brazil had the dubious hanking of having the most defacing groups and the most defaced sites, despite internet in Brazil being much smaller than US or EU.

According to Kapersky last year, Brazil is first place in cibercrime ranking in South America, and third in the worldwide ranking.

Brazil is also currently fourth place worldwide in the number of bot farms.

I do recall that many ISPs had specific provision against running IRC servers in the ToS (IIRC OVH does/did?), although in my experience it wasn't actively enforced unless you started causing trouble. Ditto for bittorent.