*"While there is no privacy audit that I'm aware of, the theory is that there is...

"While there is no privacy audit that I'm aware of, the theory is that there is no motivation to sell my searching habits to anyone."

They could sell your data for even more of a profit. Why couldn't that motivate them?

Or they could do it to comply with some jurisdiction's laws.

Or they could do it accidentally or as a leak from within.

The best protection is that no data is collected in the first place, but we need auditing to make the claim of no collection credible.