@yasu Here in Japan, anonymous SIM cards don't exist (at least, none with voice and SMS functionality), though there are rental SIM cards that only provide data, so it's primarily used by tourists.
However, due to how pretty much every single business needs to have your phone number, even if they will never call you at all, residents always end up resorting to the dox phone subscription that requires a form of ID (in the case of foreigners, residence card + passport, for us nationals it's a choice between drivers license, MyNumber card, or passport), a bank account or credit/debit card number, lots of form filling, personal seal, and quite a bit of patience, sometimes it takes hours to get from taking a seat to leaving the store.

I heard they apparently require you to measure your body temperature too now, but I've never gone into a provider store since the start of the scamdemic, so I can't confirm.

Imageboards here are kinda anonymous, comments systems on make sites are even anonymous by default, but keep in mind that both 2ch and 5ch are Cuckflared, meaning that anonymity effectively has no meaning.

But in general, Japan always tends to be behind on the rest of the developed world, even though the young adults are increasingly using PayPay, cash is still the most common payment method.
What changed throughout the scamdemic is that all the chain shops now got payment machines that give 4 to 8 different categories of payment methods to choose from, so you no longer put cash on a tray like it always used to be.
Now we have to insert it into the machine.

The smaller businesses still do it the cash on tray way, though quite a few of them started putting up QR codes for PayPay users.