Sounds like a variant of the "BeReal" concept: "Its main feature is a daily notification that encourages users to share photos of themselves with friends in their day-to-day life, given a randomly selected two-minute window every day."
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Let me know what you think! It is just based on EST for now, sorry.
Not everyone ends up posting within that two minute window and the only "punishment" for not doing so is that it just says they posted late.
BeReal is a great concept regardless, just pointing out the differences and the realities of it.
That being said, I like it as a way to just journal a picture a day, even without any contacts in the app.