1. I'll use a real world example, lets say I work at a restaurant as a server, I quit my job and start a new restaurant as a manager. Anything wrong with that? Nope, though people at the old place might be salty, sure. Also, just because Cinni folded doesn't mean it was a scam, in this industry even the legit projects are susceptible to huge price spikes (remember December 2013?)
To make a proper comparison it would be the same if:
You sold restaurant shares hyping how much you love the restaurant and how you are amazed by it and plan to attend it directly the coming years, then after your shares were sold, you got a "family issue" and just leave the restaurant, which turns into a shithole in return, 2 weeks later we find you opened a new restaurant and now you have previous restaurant shares to support your own.
Changing jobs is no issue, everyone is allowed to do that, what cant go on is all the trickery and scams used by this same people.
Karma is a bitch, is only normal that it will end up biting them in the ass.