No, that's not how this works.
This outcome is almost certainly seen as a failure by the VCs. It looks like an acquihire. If so, it's quite possible that the VCs didn't even get their money back. Acquihires generally do not return money to VCs -- obviously, given that the employees are free to work anywhere, the acquirer's interest is in paying as much as possible to the employees and as little as possible to the now-worthless acquired company.
It's likely the employees are the ones benefiting most from this outcome, in that their pay has probably gone up considerably and they are no longer nervous about their job security, after many years of high stress and low pay.
It's possible the VCs were even offering some more cash to keep going, but at unfavorable terms, and the team said: "No, we'd rather take the big paychecks from Zoom."
Given Keybase has only had one funding round (according to crunchbase), the founders certainly still had a controlling stake in the company and the VCs couldn't force them to sell or not sell.
You can blame VCs for a lot of things but this kind of outcome is just not one of them (except insofar as that it allowed a company with little viable business strategy to exist in the first place).
(I am the founder of a failed startup. We had multiple "acquihire" offers, none of which offered any money back to investors.)