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How would you feel about a lifestyle guidance app?

Perhaps something that uses CBT, gratitude, and postive reinforcement to help people build good exercise and diet habits?

Is there a way for a company to implement sufficient privacy protocols that would appease the most privacy-concious users?

> Is there a way for a company to implement sufficient privacy protocols that would appease the most privacy-concious users?

The trivial way is to just not send data back to the internet. Nothing you listed here is impossible to do client side.