The only time I've heard investigators seizing specific amounts is when the money is cash. To my knowledge, access to all bank accounts belonging to a suspect is frozen as a matter of routine: feds don't wire out the $92,464.27 suspected to be related to fraud and leave the suspect with the balance.

To be clear, I'm not saying ots not a problem - it absolutely is[1]. However, it is not new.

1. It gives undue leverage for plea deals, and leaves suspect unable to pay for legal representation.