I’m most concerned about data that would normally be illegal to collect or give to advertisers still making its way into their databases anyway. It would be illegal for your doctor to sell details about your health conditions to advertisers, but they may be able to infer it anyway from your purchasing or search data.

Add AI to the mix and it gets worse. An AI algorithm instructed to maximize profits may charge double for a chocolate bar to someone it inferred was diabetic, but AI is non-deterministic so it would be difficult to prove the reasoning for its decision, which would be handy for plausible deniability.

And the government being able to purchase data that it would be illegal for it to gather is a massive and glaring loophole. The actions of the Trump Administration should make it obvious to everyone how massive databases with intimate and personal details could be weaponized.