So I think I understand what you are hinting at in relation to the original question. You are suggesting for example, that 800k addresses (vast bulk) are controlled by one person. So the last 200k addresses could be controlled by 50-75k people? Is that a decent guess? So in reference to the original question, how many of these holders self custody?
Discussion
I have no idea the number, but there are plenty of OG's who have tons of addresses they control. Maybe 1k addresses. So that's a 1000:1 ratio.
But again, I have no idea the actual number(s).