At least they didn't bury who was paying for the study.
Going completely cashless is troubling for many reasons. I almost never have cash that I can give to beggers and buskers now (the later sometimes have little tap to pay machines).
Given that there are plenty of people that are unbanked, it's going to be problematic to be 100%.
These are not insurmountable problems, but you have to bake in solutions. Rights to have accounts even if you don't have a fixed address (etc).