Jail time is probably the only suitable enough deterrent for adtech nightmares. Fines are just treated as a cost of doing business expense, and doesn't directly even hurt the terrible people making these decisions.
When someone commits a wrong, the punishment is in part based on the amount of harm. You might feel that adtech causes small harms, if you look at harm against an individual, but adtech folks harm billions of people, every single day.
If you're Mark Zuckerberg, Larry Page, or Sergey Brin, no fine is large enough to make you regret your life choices. The only way to punish billionaires who get rich off harming others is to take away their time/freedom, the one thing they can't just buy back. As long as corporate CEOs can't get jailed, crime absolutely pays in this country.