i thought i would mention this as i hadn't heard anything about it, but yeah, you can add a virtual debit card and spend your btc or crypto balance. i noticed it when i was adding some widgets to my revolut home screen

now before Darth force strangles me, i have no intention of using this feature or having btc on revolut, but i thought it was interesting they added it. doesn't seem to be available for EU revolut accounts, though and some of you might find it a viable option for spending btc