If there was some kind of fixed minimum compensation - even a single dollar per affected person - and strict liability (doesn't matter how you allegedly did everything to protect the data, if it leaked it's on you), companies would suddenly be very motivated to a) secure b) minimize the data they hold.

Without penalties, e.g. Hertz has little reason not to keep 10+ years of drivers licenses just in case they come in useful in a fraud case or as ML training data later. If having the data was a $153 million liability, they'd think twice.