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I think you are trying to define a taxonomy of such services based on the nominal/advertised proposition to end consumers.

I'm not sure that's the right way to quantify the startups themselves, as the business case is sometimes only tangentially related to said proposition.

Tinder for heroin (or maybe Birchbox?) and airbnb for used syringes

> airbnb for used syringes

So just regular airbnb?

Uber for X can also mean “connect the user with independent contractors, or at least people we insist are independent contractors so we can pay less taxes and push the costs for things like insurance, consumables, and equipment maintenance onto them”.

I mean the way you make oodles money is taking market share (Uber) or creating new markets (AWS). Both are valid strategies - either take someone else’s customers or create a new way for people to spend money.