That's just how adtech works in general. Every ad company has a profile on who they think you are, well more technically a cohort of potential similar profiles. Also not all profiles can equated to a single person and a single person may have multiple. That's how wishy washy the whole tech is. It's good enough though. Way better than seeing those flashy "download these smiley trail mouse cursors" ads the old internet used to have. Still. I don't see the problem here, it's just about making ads more relevant to you. If you're not the kind to let ads sway you anyway than what's the big deal? And if you are the kind to be swayed at least they'll be actually relevant to what you're into.