What you did is no different than robbing a bank. You should be placed behind bars and the sooner the better.
The developers who wrote the smart contract, are hard working honest man who made a mistake. The three startup teams from which you took the funds were entrepreneurs who invested their life into these startups that you now destroyed.
Luckily, all your funds are stored on the blockchain and as soon as you try to launder them you’ll leave a trail which will lead to you.
The only line of action for people like you is to apologize and return the ETHER you stole.
And to everyone who applauded to this article or treat this like a coding exercise, I say, shame on you.
Disclaimer: I’m unrelated to Ethereum or to any of these teams but seeing a scammer or hacker gets away with it makes me really really mad.