Can you name me any transaction that would not be taxable? All commerce is taxable.
Your calculation is not quite complete. The only way you would owe $1 on your coffee is if you had realized a huge profit. You owe a percentage of your profits. Lets say it's 20% (it could be less or possibly more). So if you bought a bitcoin for $1 and then it rose in value to $5; you owe $1 in tax on the gains. That is still a 300% gain after taxes. I would definitely enjoy drinking that cup of coffee.