Why didn't SBF flee?

I was wondering why SBF seemingly behaved like an innocent man. Giving interviews, talking to podcasters, remaining at his residence.

Why didn't he make a run for it?

If he did take all those billions as was claimed, why didn't he move to a country that doesn't extradite or just move off the grid for a couple years?

Was he burnt out? complacent? drugs?

Or did he never have that money in the first place?