None of the tech companies are selling your data to advertisers. They allow advertisers to target people based on the data, but the data itself is never sold. And it would be dumb to sell it because selling targeted ads is a lot more valuable than selling data.
Just about everyone else other than the tech companies are actually selling your data to various brokers, from the DMV to the cellphone companies.
Just about everyone else other than the tech companies are actually selling your data to various brokers, from the DMV to the cellphone companies.