It looks like if I wanted to I could have the same private and public key for: Ethereum, Ethereum Classic, Tomochain, Vechain, Wanchain, and Aion networks because they were all built on a copy of Ethereum.
What other networks exist like this? Is there a comprehensive list somewhere?
(It got me thinking about a fun scavenger hunt: give a key but don't tell what network it is. Let the race begin!)