Many companies shrink staff when projects are finished or when growth slows. Tech companies, don't always do this but look for 'a reason' to shrink staffing.
And then it becomes much harder for them to hire a similar quantity of workforce (think the 18% that Coinbase just fired), because it costs even more money to train them to the standards of the previous workforce.
I think most of the layoff had nothing to do with the main business of Coinbase, as an exchange and a custodian for others. This paragraph:
There were new use cases enabled by crypto getting traction practically every week. We saw the opportunities but we needed to massively scale our team to be positioned to compete in a broad array of bets.
makes me think that once they saw millions coming in from each direction, basically everything you sod was making money they've just gone on a hiring spree trying to get a piece of the pie from every possible trend since those turn into fads pretty quick suddenly they realized not everything brings money forever.
Tbh, I really wouldn't overthink them being insolvent and all those kinds of things. It's highly likely that they're expecting lower demand in the future, and they're just taking into consideration the deeper economic risks.
There is no way for them to become insolvent, but it's about time they stick to what they were doing best and profitable even during previous bearish seasons, being a crypto exchange, stop with the Defi and NFT garbage that have turned into money pits for almost everyone.