Maybe I am stupid, but since I came to this forum it bugged me out what these banned avatars with crossed name mean... Ok at first I thought that these were banned some time ago and therefore lost their account... but sometimes I just see posts made a few hours ago by these guys and I am wondering if they could got banned in that time span, or is this just a common avatar picture that everyone loves and therefore puts it up?
They get the banned avatar even if they are just suspended for a specific amount of time. After a certain amount of infractions, a person will receive a suspension. They lose their ability to post and their avatar gets changed to the banned avatar.
To clarify on what other people are saying, people get the banned avatar on all their posts when they're currently banned. The moment they're able to post again their avatar goes back to normal. So if people are perma-banned then they'll always have the banned avatar.
The infraction system is pretty simple. Each infraction against the rules carries a certain number of points. Most simple spam/troll/flame infractions are 5 points, but they scale up for the severe stuff. Points decay over time, as well, they aren't permanent.
If you reach 15 points, you get a temporary suspension, and every future infraction that adds to that point total results in another. As your point total rises, the bans increase in length. They start at a 3 day suspension, and will extend out to weeks then months and finally a permaban. If you're currently suspended, you get the name-crossed-out and banned avatar treatment, to let everyone know. That doesn't mean they were infracted for the post you're looking at; if you look at the bottom right corner, there will be a red mark if that post received an infraction.