I've had the same problem. They locked my account which I was using since 2015 by invalidating my KYC and refusing new verification attempts. The support emails take days/weeks to get answered or stay ignored, and didn't lead anywhere.
Thankfully I had installed the mobile app on an old phone, and I was able to login through the app and withdraw my funds.
That's damning both for their customer support and their security. Good thing they have decent existing and upcoming competitors.
I don't see the $100B valuation sustaining unless it becomes another meme stock ala TSLA. But then we're back to our issue, most Tesla users love their car, most Coinbase users hate it. How could it get widespread retail endorsement?