I've had some tenX for a while now, never dabbled in the card as I'm not Sure what the status of use in Canada is. I'll look into that now.
Reading your article definitely made me consider doing some more research tho. I think the fees r a bit higher now, like 15USD for the physical card and possibly 10USD if you don't spend over a certain amount in a year.
Still most people pay way more than that for a bank account annually and also for credit cards etc..
My favourite sentence "...this means that until the exact moment of my purchase, my earnings are all investments."