There are some excellent points here... not to mention Ethereum also had a pretty large pre-mine that nobody ever really talks about. Aside from things like Monero (and WOWnero?) and Pirate Chain (ARRR), I don't know if anything is truly secure. Even the ones that are right now perhaps have vulnerabilities we're not even aware of. Just thinking out loud, I guess. So many variables in a place that nobody's been before. Thanks for shining your light on it! :)