Investors wonder if apps that are meant to be curative are really a sustainable business model, reports CNBC.

In digital health, a burgeoning space that is attracting billions of dollars in venture capital, investors are most attracted to business models that involve recurring revenue from users who will continue to use the app or service forever. As a result, digital health products that have attempted to cure or prevent a health condition have historically struggled to raise funding, health experts say.

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