My conspiratorial mind thinks that the security features of Monero are exactly why it's not on Coinbase. Coinbase is the closet thing to the "Establishment's" involvement in Crypto. It's a threat to their kleptocracy as they can't track you.
Maybe governments still dont get it, but their best chance is that people trade Monero on centralised exchanges where they KYC. So they know who enters into Monero and who exits of Monero. When everyone will use decentralised exchanges governments will be blind. And if they already start pushing people off centralised exchanges now would be super dumb for every government.