Most people don't use cryptocurrency to pay for stuff, but back when I lived in Cambridge there was a nice pub where you could buy your pizza with it, and last week here in Berlin I passed a Subway[0] that let you pay for your sandwich in BTC. Or at least it said it did, BTC by itself is a terrible idea[1].
[1] And to shortcut the conversation: Alice: *something about payment layers*, Bob: *how payment layers destroy the one thing BTC actually does provide*
[0] And a subway. Except the subway was elevated and the "proper" railway was submerged (but not covered): https://www.google.com/maps/search/S%2BU+Schönhauser+Allee+(...
[1] And to shortcut the conversation: Alice: *something about payment layers*, Bob: *how payment layers destroy the one thing BTC actually does provide*