Comment by zo1

So for a perfect match they'd need to have some sort of unique identifier that's present in the first set of data you ask them to remove, as well as being present in any subsequent "acquisitions" or "scrapes" of your data.

If these devs that scrape/dump/collate all this info are anything like the ones I've seen, and they're functioning in countries like the US and UK whereby you don't have individual identifiers that are pretty unique, then I'd say the chance of them being able to get such a "unique" key on you to remove you perpetually, is next to impossible. And if it's even close to being "hard", they'll not even bother. Doubley-so if this service/people/data is anything like the credit-score companies, which are notoriously bad at data de duplication and sanitation.

Likewise, if you want them to do some sort of removal using things other than a unique identifier, then you have to have some sort of function that determines closeness between the two records. From what I've heard, places like Interpol, countries' border-control and police agencies usually use name, surname and dob as a combination to match. Amazingly unique and unchanging combination, that one! /s