I think a very good example of this is FGators. Pre-legislation I get the feeling he was a winning player, playing tightish and robotically multitabling msnl. Always checking for pot control with top pair no kicker and mid pair, rarely bluffing except in std "bluff spots" always raising similar amnts pre and post flop, but still winning enough money from the donators to get by.

Now I play at almost any table he is at, and I think he has graphs posted on 2p2 of being down like 40 BI in a couple months. Games have just gotten A LOT harder- at least on Stars where I play, and we all have to adjust.