I know that some American tourists actually do this, on giving servers cash tips as if they’re underpaid by their employer (since they’re used to it in the USA along with growing up with that mindset) but overlook the fact that servers are paid the minimum wage in the EU, as it’s not “typically” the norm. This practice is being exported it seems, in another region where that isn’t common.
Legally this is true in the US. In practice, people claim enough to hit “real” minimum wage and no one usually cares (until that tipped employee needs to prove income for a loan or something and they’re screwed)