1. Have some explanation
2. Have a new CEO who is willing and able to do the job
If you can't do these things, then you probably shouldn't be firing the CEO.
Nobody comes out of this looking good. Nobody. If the board thought there was existential risk, they should have been willing to commit to it. Hopefully sensible start-ups can lure people away from their PPUs, now evident for the mockery they always were. It's beyond obvious this isn't, and will never be, a trillion dollar company. That's the only hope this $80+ billion Betamax valuation rested on.
I'm all for a comedy. But this was a waste of everyones' time. At least they could have done it in private.
There isn't just a big red button that says "destroy company" in the basement. There will be partnerships to handle, severance, facilities, legal issues, maybe lawsuits, at the very least a lot of people to communicate with. Companies don't just shut themselves down, at least not multi billion dollar companies.