Is abuse of them cheating? Would a site ever rule them as such if obviously abused?
You have

Big raise PF
Flop

Big raise
Turn

, other player goes all in for the pot, $500
...........Right clicking your broadband connection and disconnecting puts you 'artificially all in' and lets you showdown for free, without calling the bet.
Should it be phased out now that most people have reliable internet connections?