It depends. You don't know what their layoff strategy was. It's possible to do a 30% layoff and still be hiring. You should still continue looking since you do

It depends. You don't know what their layoff strategy was. It's possible to do a 30% layoff and still be hiring. You should still continue looking since you don't know what you'll be getting into. If they do rescind the offer, since they'd be screwing you pretty hard, I'd ask for pay and health insurance until you find your next job, but also ask them to connect you with other companies their VCs have invested in. Feel free to ask even if they don't offer. If they offer severance, feel free to ask for more. IANAL, but I doubt you'd have much legal recourse. California is a right-to-work state. Public shaming is always an option, but that can be personally and professionally expensive.