The three amenities
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Hotel
High turnover, consistent brand, buying decisions made centrally and volumes that make dispensers obviously economic. The most affected by the rule and the fastest to move.
Airbnb and vacation rental
Explicitly inside the definition of a lodging establishment. Lower turnover, an individual making the buying decision, and a guest experience that often leans on the amenity feeling personal.
Which makes the larger bottle work better here
A six-ounce bottle in a rental replaced when empty is a sensible answer, and a wall-mounted dispenser in a private apartment often is not.
Spa
Where the amenity is part of the service rather than an incidental. Glass, larger formats and refills all sit comfortably, and the guest expectation supports a better object.
The archetype treats all three the same
A travel amenity, 10 to 120 mL, pumped, with leakproof under pressure change as the whole requirement. That window is entirely below the six ounce line, which is worth noticing.
So the archetype describes the banned product
Not as a criticism of the taxonomy. It was written for travel decanting, which is what amenity bottles are, and the regulation arrived afterwards and made that window a problem in one setting.
The guest-facing difference is quality
Once everybody is compliant, the amenity competes on the product and the object rather than on being there at all. That is a better market for a supplier with something good.
And the sale is to three different buyers
A procurement team, an individual host and a spa manager want different quantities, different formats and different conversations about the same formula.
One formula, three conversations
A hotel buys on volume and consistency, a host buys one case at a time, and a spa buys on how the bottle looks beside the treatment. The compliance answer is the same for all three and the format is not.