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I thought it was pretty clear :-)

It was perfectly clear, I don't know what the parent is on about with blackmail.

How is that dishonest? It sounds like a great way to improve security and get bounties.

I'm sure (paying) customers will be totally fine with Prezi's source code being available to anyone that want to try to hack the site.

I fail to see how that has anything to do with honesty. The source was leaked accidentally.