Also, please keep in mind that using BTC to buy something (anything) is a taxable event and if you make a profit on a BTC transaction, those gains are subject to the capital gains tax. If you lose money on the transaction, it's still technically supposed to be reported even if no tax is due.
What do I mean by this?
If you buy BTC when it's at $60,000 per coin and you then use it to purchase something, like a cup of coffee (for example), after the value of BTC has risen to $65,000 per coin, that "sale" or disposal of BTC in exchange for the cup of coffee generated for you a capital gain. In other words, you made a profit of 8.33% on your BTC "investment". You are now a foreign currency trader lol.
How many people actually report this? Who knows... but if I had to guess, it's probably close to zero.