"Back in" before day's end, I see I did not address your curiosity about why the big exchanges don't allow American citizens. I honestly am no expert on the topic, but I think it has to do with the SEC's view many cryptos are securities. Unless "registered" or something similar, they can't be traded. And the time & cost of getting them "registered" must be prohibitive.
Some, like Binance, have gone to the trouble of setting up a separate exchange for the U.S. But the cryptos offered are very limited.
Thank you for the kind words about my garden posts. I was in a (rare) nice rhythm in getting them written, when the "Valentine's Day Surprise" changed everything ...
Quickly followed by our "fearless leaders" deciding to "lockdown" America, as well as much of the rest of the world ...
I'm sure I'll get back to them at some point. 🙂