You maybe missing the part that it’s a transaction between two people, it is a TIP, not a payment to a company, or for a service, it is a thank you, or you could even call it a Gift.
Each year I am allowed to gift money up to 18k to any person I choose and guess what, they do not pay taxes on the gift. Why then is it different for those who rely on tips.
Again, our tax system is so completely horrendous, it is appalling the more you know of it. It is weaponized when convenient, it is leveraged for compliance, it is literally impossible by design to not break in some way. Lots of Atlas Shrugged quotes come to my mind here.