I buy CRO from time to time but I'm mostly using it in the Supercharger event.
I got involved initially because I could send funds there directly from my UK bank account but moved elsewhere once that stopped.
My pounds got changed into TrueGBP so I decided to leave them there rather than faces fees of moving them out. Then I used them to buy CRO from time to time. I think I'm down to my last £7 though so that will be it for now, unless I decide to get involved with the Earn stuff.
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It's interesting to hear how many people are involved with it!