aren't you only a felon if you are convicted ?
i would bet half the people saying that have been to jail are just trying to act tough.
I think there are plenty of people who've been in jail just overnight when they for picked up for being drunk or something and then it wasn't pursued through the courts. I've been to jail too (but only as a visitor, is what many are forgetting to add).
In any case this isn't going to happen. The government can't agree with what to do about bitcoin, they aren't going to let inmates start using it!