This is a Square user PSA : Not every Square Merchant has brand new Square hardware. I have never updated my hardware. The new hardware points a screen at you and the Bitcoin option is very clear.
Bitcoin payments work on old hardware ( I actually set them up to work with
@ZEUS more than a year ago because they are GOAT)
The cashier may need to select it or spin the terminal for you to select that payment option.
I always see so much confusion and false user expectations around the realities of all the different hardware options. You may have to ask or push a few buttons.
Also I have only had two payments in Bitcoin, both from the same lady, who doesn't own any Bitcoin. She used CashApp to scan the LN invoice and pay from her fiat balance. So it isn't just for Bitcoiners. It is actually an attack on fiat.