25 years is a damn long time. I don’t know how that can “seem low”.
Add in the desire to be seen as doing something with sentencing inflation and your get multiple hundred year sentences.
At first I felt that 25 years was short but thinking about it, he will be ~60 when he gets out... so maybe not too short.
They gave him a 150 year sentence for a crime on par-ish with SBF's crimes, because at 70 there is little difference between 20 years and 100 years, so you may as well go for the shock value.