"popping champagne" is a figure of speech (perhaps hyperbole, or an idiom) meant to express not the literal act of "really popping champagne", but instead reaping the benefits of a seemingly poorly calculated business move by the other guys.

Claiming Dario is the bad guy in any context is kind of a tough characterization to agree with, if even a fraction of one interview with him has been seen.

To stay on point though: OpenAI hiring OpenClaw creator does seem to lean away from a serious enterprise benefit and towards a more consumer-based tack, which is a curious business move considering the original comments perspective of OpenAI.