Isn't 0.5% very competitive and basically nothing compared to taxes on the transaction?
Here in Poland we have a budding "save cash" movement. And they make some good points about freedom and privacy but are the loudest about the processing fees when mostly it's a way for smaller merchants to avoid paying taxes. Which is fine, I think they should be exempted anyway, but let's not pretend that it's the 0.5% in fees rather than the 30% in taxes.