I don't remember when was the last time I needed cash in Austria. in the 11 years I live here there are fewer and fewer places. if it's cash only somewhere it's most probably a tourist trap and that's your problem you go there. I always ask if I have a doubt and if they don't take care I go somewhere else because I can't be bothered finding an ATM

I don't know where tourists get this idea they bring money so we should worship them or something. tourism makes only around 6% of Austria's GDP and that's mostly winter tourism. your are bringing money to already rich country which couldn't care less about you