What Can and Can't Data Removal Companies Do?

I was just browsing [privacytools.io](https://privacytools.io) and they have an ad for a data removal company (not sure if I'm allowed to name it so I won't). They state that they will delete your personal data from data brokers and keep it from being sold, etc. However, what exactly does this ***mean,*** in practical terms?

For me, for example, as someone who has no social media, and for the last couple of years at least have been using ad-blockers and a …

companies data data removal privacy