I was jailed for sitting on the sidewalk in front of my old high school when I was 18. The police were called on me by the vice-principal, who could see from his office that I was rolling cigarettes, and thought I was rolling joints. The police showed up, realized that the call was bad because it was obviously loose tobacco, and decided to charge me with "criminal trespassing" because it's a charge that the police can press themselves without a complainant (the vice-principal was informed by others what had happened, would have never pressed charges, and was extremely regretful about it afterwards.) I spent the night in jail, and part of the next day, until my family could raise the money to bond me out (money completely lost; a bond, not a bail.) Luckily my uncle knew a bailbondsman personally, because as a loser black punk rocker teenager no other bailbondsman would take our money. If that hadn't happened, I would have spent a week in jail waiting for my hearing. My entire relationship with my public defender took place walking down a hallway towards the courtroom, where he told me that I could take a plea bargain (i.e. plead guilty) in exchange for no time, no fine, no probation, and a removal from my record if I stayed out of any trouble for six months (and of course the opposite if sitting on the sidewalk went so badly for me again.) I took the plea bargain, which required me to admit to the crime and pay court costs.

The reason SBF isn't arrested is because the people who would have to order him to be arrested relate to him personally, and coddle people like him as they would wish to be coddled themselves.