Coinbase is different. The conversion to stocks doesn't happen at grant-time value for all of the grant. The conversion happens at the start of every year of the grant life. So if the stock goes up in the first year, you get fewer stocks for the second year (equaling to grant/4 in value). See my other sibling comment in this thread.

It’s unclear to me why this is being downvoted: that is exactly how it works at my (FAANG) employer.