You're not taxed with the usage of cryptocurrency though, you're taxed when you bought that item with fiat so the only taxable event is the time that there's a fiat interaction. Regards to transfers, I think that in some way, transaction fees in crypto counts as tax but with a lot of extra steps, think about it, the tx fees are used to pay the miners and those fees that the miners get, they convert it to cash and when they do it, they likely buy something for themselves that will benefit them and those stuff will involve taxes.
Let's say someone earn Bitcoin whether it's from giveaway, freelance or jobs, it might be not a taxable event when you directly spend it (no capital gains since you use Bitcoin as a currency). But you still need to pay income tax because it's one source of your incomes.
Although it will decrease the tax you need to pay, but it's not a way to completely avoid paying tax.
