[demifiend]

> Why I must opt-out from selling my data?

Opt-out is more profitable than opt-in. If adtech had to make do with opt-in, it would starve to death for lack of data because most people make do with the default option and—as you pointed out—most people don't want to be stalked or to have their data rented out to every corporation that wants to send them an unsolicited sales pitch.

Also, opt-in is the advertising equivalent of self-reporting in polling. You're not getting a representative sample of the population.

[htfigoosrh]

> Opt-out is more profitable than opt-in.

I know but so what? It's not "protecting my privacy" if it's opt-in by default...