1) Alright so here's what I gather happened with EMN:
was working on a new protocol. It was still in the testing phase, not ready to be released, in case e.g. it had bugs. He hadn't yet vetted it.
It did, in fact, have an exploit
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3) The people who found it started talking about it and spreading it (probably not maliciously -- probably just excited).
Everyone wants to get in on the next big Andre project, so people started FOMOing into it when they got wind of it.
So a bunch of people started buying.
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4) But, remember, it wasn't tested, and had an exploit (involving flash loans).
So someone exploited it, taking all the funds ($16m I think?).
The hacker then sent half to Andre (as an "I'm sorry" note?) and kept half for themselves.
Andre wakes up and is like 'WTF happened'.
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He used the yearn deployer though, its hardly an attempt to keep it secret.
Andre literally retweeted it AFTER his little poll asking if he should just release the new YFI protocol or do a white paper first
I think the Andre Eminince retweet and other credible tweeters made it seem like a legit sneaky launch