Coinbase was founded, from day one, to be the most compliant cryptocurrency exchange in the US. They have hired massive teams of former lawmakers and regulators to try to navigate the path to get cleared by the SEC. If Coinbase hasn't been able to do it, how could any other company reasonably expect to do it?
I expect that when Coinbase eventually responds to this, likely in the next few minutes, the response will contain the full timeline of everything they've done to try and register. I've been listening to their lawyers get interviewed on podcasts and seen the countless blog posts they've posted about trying to get anything from the SEC, which has been entirely ignored. It's pretty infuriating. The SEC needs to label Coinbase as some lawless entity that refuses to follow the rules, when nothing could be farther from the truth.