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Published guides, grouped by the company they start from.
Each group is one proven model. The links under it are the markets already checked.
Airbnb
Airbnb for parties: does it exist?
Airbnb for pools: does it exist?
Duolingo
Duolingo for bible: does it exist?
Duolingo for coding: does it exist?
Duolingo for cooking: does it exist?
Duolingo for finance: does it exist?
Duolingo for geography: does it exist?
Duolingo for sign language: does it exist?
Goodreads
Goodreads for movies: does it exist?
LinkedIn
LinkedIn for doctors: does it exist?
LinkedIn for trades: does it exist?
Notion
Notion for lawyers: does it exist?
Patreon
Patreon for nonprofits: does it exist?
Peloton
Peloton for seniors: does it exist?
Shopify
Shopify for artists: does it exist?
Spotify
Spotify for meditation: does it exist?
Strava
Strava for lifting: does it exist?
Tinder
Tinder for friends: does it exist?
Uber
Uber for kids: does it exist?
Uber for laundry: does it exist?
Uber for women: does it exist?
Zillow
Zillow for commercial property: does it exist?