I haven't played in a while, but I hear that all sorts of crazy stuff is happening. A friend of mine created a new XBL account, and went to GTA:O. As soon he was done creating his character and got through the tutorial, he joined a lobby. After that, he found himself amidst a sea of money.
Supposedly, R* is fixing this with the next patch though, removing money obtained through exploits, and punishing the exploiters. But people have found ways to glitch around all these patches, let's see what happens.