If I pay for a business to make me a chocolate milkshake under the same health code regulations and standards as the place across town, I don’t want them finishing it off by stirring in a spoonful of shit with the ice cream as a bonus. Even if >99% of what’s in the cup is not shit, it isn’t somewhere I’ll go and I’ll make an effort to discourage people from going there too.
Osteopaths, chiropractors and all those other flavors of cargo cult imitation medical quackery differ only by the proportion of ingredients. Making a distinction between them is meaningless, it just lets the less-obvious liars get a foot in the door.
(Additional note because this is the internet: This is a “spherical cow in frictionless vacuum” scenario and ignores things like accidental contamination as well as the narrow range of illnesses where an appropriately-prepared and administered fecal transplant (which this is not) may be indicated.)