The thing with banning people from the internet is it severely affects your ability to function in a modern society. Banking? I can't remember the last time I visited some brick and mortar bank office. Hell, they'd make me pay extra service fees if I went there. Job hunting? Pretty much all is on-line. An increasing amount of government documents and applications are on-line and they're actively pushing people towards using them and discouraging people from visiting any actual office. That trend will only continue and dependence on access to the internet will grow.
Banning someone from the internet for allegedly sharing copyrighted files is an unreasonable punishment, especially if there is no proper investigation, no trial, no judges, no way to defend yourself and no way to appeal for a reversal.