(I'm an engineer on Monitor.)
Time is a finite resource, and a lot of these data brokers seem to be very geographically-specific and have their own ways of requesting deletion.
Personally, for this specific functionality, I don't think the EU wouldn't be at the top of the list though: these types data brokers are way more of a problem in other countries. We have laws like GDPR :)
Also: are you the JohnTHaller of PortableApps fame? If so: thanks for making my high school computer usage bearable, way back when!
- USA
It is listed in places, but clearly not explicitly enough in the right places.
haveibeenpwned will notify you if your email address was in a breach.
The Mozilla offering seems to include the same, but also cover other pieces of personal data, and the ability to request removal from data brokers.
And yes, you could probably go and ask the brokers directly, but that is certainly a lot of time and effort, so paying for it might make sense, assuming you trust the service provider.
The new thing is scanning for your info at data brokers (for free, but USA-only), and automatically removing them and continuously checking that they stay removed (paid, US only).