Waiters in the U.S. make more, due to tips, despite the U.S. having a lower minimum wage. Do you think American waiters want to make $2k/year less? That's nearly 10% of their income.
And that's before even factoring in the tax benefits, which is exactly what this article is about! No tax on tips means nearly all of that income is untaxed. French waiters pay 11% taxes, and British ones are in a 20% tax bracket. The difference widens even further.
Tips allow American waiters to earn more, and no tax on tips makes them take home even more. Hand-wringing about how the American system pays less than the European one is innumerate.