You're correct in the case of selling a covered call, which is what I did.
This seems too good to be true. Why don't you just borrow money on your credit cards at 21%, buy bitcoins, lend them out and get a guaranteed 72%?
It's not a guaranteed 72% unless bitcoins are worth what you paid for them before the option expires.
I wish someone would starting writing puts come on pumpers put your money where your mouth is