There are no 75GB/mo caps on VM as far as I am aware, I routinely do 200GB+ a month and have never had a whisper from them.
My friend did 1.5TB/mo once and they sent him a letter saying to please not do that again.
bhaak1 writes: "The first — and hopefully annually — NetHack Cross-Variant Summer Tournament called Junethack has started last Sunday and runs until the end of August 14th. This tournament features Vanilla NetHack and several of its forks: SporkHack, UnNethack, AceHack and as a special bonus game — never seen on a public server before — NetHack 1.3d, the first version of the game called NetHack, released 1987. There are various achievements to gain, even for those poor souls that can't win this complex and sadistic game. The source code of the tournament management and website software is available for hacking on GitHub if you prefer hacking code to hacking monsters."