Oh, that explains it. They should also offer subsidized housing then, because their employees will quickly figure that the non-negotiation policy doesn't work on the housing market.
Where are you getting this? If you joined Coinbase in January, your equity was granted at an $8bn valuation. Today it’s at $56bn for a quick 7x in 5 months.
In any case, that's moot. Because if you join now (after they are making this change), your equity is being valued at ~$60bnm so the upside is significantly lower.
[1] If that's from the valuation at last funding round, then that's being disingenuous since no one thought that they are worth 8b then, and I would be surprised if they were offering equity at the valuation.