Putting 2 and 2 together, it became obvious that the unusual way I was generating entropy (which I wont post publicly in this thread given the security implications) was likely identical to that of an early, closed source wallet that didn't gain too much traction (or at least the devs eventually noticed the vulnerability and changed the way they were generating keys for end users).

Man that's fucking wild. Imagine you'd just come across this super old-ETH loaded address or smth

That is btw from the earlier article which Reddit OP also linked to: https://www.reddit.com/r/ethdev/comments/1l45yqf/i_was_messing_around_with_ethersjs_and/