If anyone is wondering, this happened because I accidentally opened the app while on vacation in a country that the US sanctions.
They froze my account, required that I pay them money to even get access to my transaction history, and then when I did (foolish, I know) the records don't show any reason for me to have owed them money.
It wasn't a large amount (<$50), but I'm still pretty upset about it.
I have moved to another platform.
It's not a unique issue either, just look at all the posts on the Coinbase subreddit: https://www.reddit.com/r/CoinBase/
It reminds me of the time Washington DC had a baby earthquake and verizon's network promptly fell over. When it flops under non apocalyptic loads, you get a dark glimpse of the inevitable catastrophe when the big one rolls around.
When (not if) the next bank run occurs, you'd better hope you can get yours via the vanilla coinbase UI, because you will be all on your own. (FWIW I have money in coinbase after this experience, but only an amount that would not cause me to need therapy were it to catch on fire)
That doesn't exactly happen overnight.
If supporting your customer base makes the business unprofitable then you don't (yet) have a viable business model.