I'm not affiliated with a16z in any way, so I can't speak for their thoughts, but I do know that it isn't uncommon for VCs to have an "IPO or nothing" point of view. They invested in Clubhouse at a $4billion post-money valuation with what I imagine was/is a belief that it could be a $40billion exit in the future.

Oh, yeah if they invested at a $4 billion post I can see that exit being really unappealing.

I assumed they went in at an earlier round at a eight or nine figure valuation, so I was thinking it was a 10-100x on their money in a year or so.