I tried to mine it a few years ago on a couple of machines. The net benefit was close to zero and I realized even if I rented a lot of them, it was simply not worth the hassle. So this is from the "creator's" point of view.

As an user, I simply don't need it. Most of the time I buy physical products so I have to give them my real address anyway (I could set up an alternative way but again too much hassle for almost zero benefit). For these few times when I actually buy digital products, I simply don't care enough and I pay via Paypal. So yes, they can profile me using my Paypal address, but that's the price I'm willing to accept.

As a merchant, I simply wouldn't accept it because of high volatility and related problems. Also, in my country there are certain rules for entities of certain size and I'd need to do additional bookkeeping just for that.