I run a construction business and I have close relatives who refuse my services because I don’t take payments “under the table.” Their reasoning is that I don’t need to pay taxes and they get a discount. Win-win - except for that the entire risk of legal consequences is on me and secondly it’s exactly because of people who do this that many of my customers have unrealistic expectations of how much it costs to hire a contractor. The dude doing it for 30€/hr is not paying taxes on that.
I will continue calling out the political soapboxing here for as long as I either get banned or they change the name of the community.