Tax evasion is still an estimated loss of tens of billions of euros of equivalent per country every year.
https://assets.publishing.service.gov.uk/government/uploads/... https://www.dianeosis.org/en/2016/06/tax-evasion-in-greece/
https://assets.publishing.service.gov.uk/government/uploads/... https://www.dianeosis.org/en/2016/06/tax-evasion-in-greece/
Of course it exists but evasion isn’t the first thing I’d think of when considering a cash only business.