I can't speak to cultures outside the United States. I can't even speak for all hotels in the United States. But, I did work at a very AAA Four Diamond luxury hotel run by a very conservative (demeanor not politics) General Manager. We had rules about everything so as to keep things egalitarian for all guests and employees.

In terms of gifts, everything had to be reported. Managers kept nothing in order to avoid even the appearance of quid pro quo/graft/fraud. All gifts of food and beverage were discarded unless the guest was a very frequent guest. (At that hotel, a very frequent guest was someone staying more than 100 nights annually. That was 100 nights at our hotel, not the chain.)

That said, not all hotels are so regimented.