COBRA means employees paying the employer premium, by guaranteeing COBRA, an employer is saying "We won't stop paying the health insurance company for _everybody else's insurance_, so you'll still have someone to pay" - it's a great PR jiu jitsu move, I didn't realize until this thread how confusing it is - I'm only familiar with it because sadly I had to sunset a company in California.
That is the most convoluted interpretation of offering COBRA, and is almost certainly incorrect. You're referring to the fact that an employer can technically terminate COBRA by ending all health insurance plans. But Coinbase would have to stop offering any health insurance to all their current employees for this to occur. If that happens (I'm virtually certain it won't), there would be an actual employee riot/exodus and the tech media would be all over that story.
So are you saying the Coinbase CEO simply said something to the effect of “we will maintain our insurance plans for 6 months company-wide”? That seems disingenuous.