> They made the software for the badge of your entire conference, for free, and then you won’t let them talk about it because what you got for free, wasn’t what you expected/wanted?

You are saying this like it is unreasonable, but it seems entirely reasonable to me.

Just because you do something for free does not entitile you to a conference talk about it. If you wanted to be paid for it (and make no mistake, a conference talk is a form of compensation. In many conferences companies pay huge sums of money to have a platform) then they should have got a contract.