So it turns out that Michael "Reply All" Waltz, Trump's national-security advisor -- the guy who accidentally invited the editor of The Atlantic into a Signal chat to reveal top-secret military plans in realtime ...
... also had left his Venmo "friends" list comppletely public
Wired discovered this and reported it, whereupon the account went instantly private: https://www.wired.com/story/michael-waltz-left-his-venmo-public/
(in other news, Wired continues to kill it)
https://www.wired.com/story/michael-waltz-left-his-venmo-public/
Unpaywalled: https://archive.is/G68KW