Some genealogy sites used to have far more detailed, open content, but internet sleuths often use families trees to infer power & relationships amongst the wealthy / powerful. I imagine genealogy sites were some of the first to get dead-internet'ed or scrubbed down.

An example I can think of is there's a current prominent US governor whose family is very corrupt and powerful in the given state, yet references to her connections via marriage in the fam were recently scrubbed on Wikipedia, literally family obits that mention her also scrubbed.