Cash has its benefits, I never said otherwise. But said benefits are for the individuals. Shops use it as an excuse to avoid paying taxes, and pricing differently is not noble at all.
You mention tipping, well good thing this is Europe then, where many places already did away with this stupid custom. Covid relief packages for restaurants in France were based on declared income. I'll let you guess why some owners complained they did not get enough help during the crisis.
I don't like that we have not found (or even looked for) a compromise in terms of privacy and safety between cash and cards, but I won't feel bad for hypocrites profiting from my tax money without giving their own share. 99% of people in Europe have never even had 3k worth of cash in their hands anyway
Find someone rich who would believe you have this pact with a génie, and promise them a 100% ROI.
Thinking of it, that's not the worst idea for a new ~~sect~~ religion...