Personally I've never really been bullied (well, only like, normal kid stuff when I was younger since I had good grades and a hormonal problem), but I've had friends who were and it wasn't pretty, from what I've seen, the person being bullied needs to show that they want it to end, of course, blackmailing cases and stuff like are more complicated... Humans are pretty weird creatures, they can be strong and they can be weak and unfortunately, a lot can break under sheer pressure, the worst kind of bullying I've seen is psychological one, like, leaving that person eat alone everyday, not talking to them yet laughing behind their backs and then when those people get desperate, one of them pretends to be a friend, just to break them even further... Personally, girls are much more cruel regarding the psychological one, while most male bullies just resort to violence (of course, not all of them, but the majority), violence ones are the easiest type, since as long as the person has the guts and will, they can eventually learn to fight back, whereas psychological is much, much deeper, and those wounds take a lot longer to heal.
Anyway, bullying is bad, but, it shouldn't really be considered a crime, some types of bullying should, but not most.
In the universities at my country, freshmen are pretty much bullied, they're forced to do whatever the older ones say (although there's limits obviously) or their lives in university will be a real living hell and they won't be able to partake any of the activities or clubs, however, that sort of bullying is made to prepare them for their future, the seniors also had the same treatment as freshmen, and so the tradition goes on, work places are pretty though, especially with the current crisis since bosses try to make the employees quit their jobs instead of just firing them, since they'll save a ton of cash that way.