The US tends to punish white collar crime much more leniently than blue collar crime
It would be interesting if someone compared/aligned this with the fact that capital tends to be taxed at lower rates than labor.
Too big to jail.*
* Unless you ripoff rich or powerful people like Madoff or SBF. If your quant shops causes global financial chaos on a diffuse and global level, it's okay to use financialization trickery like LTCM.
There are quite a few people jailed for longer than 25 for lesser stolen amounts, typically by various three-strikes laws, multiple counts etc.