on a serious note, koyfin is really very nice and does a better job than Bloomberg, at least for equities
Account cancellations and so on are automatic of course, but anything that can’t be rolled back requires human input.
It is possible, but it is expensive and risky to do it right. In my case there were perhaps five people that requested data deletion over the span of 8 years the site was working. Features that are so rarely used you don’t automate.
Granted, I could’ve added a button that would send the e-mail automatically. It just honestly never crossed my mind - will implement it in future sites :)