alt Hacker NewsOP is simply sharing a little game he made for a family member and inviting others to play with it. That's just the kind of thing Show HN is for.
A project like this doesn't need a privacy policy or a data policy, and it doesn't need to address social problems. If we start imposing bureaucratic checklists and social burdens on little projects, that will smother them and kill all the fun.
If and when it turns into Facebook, legal teams will do the needful. In the meantime let's use HN to respond to people's projects in the intended spirit: fun, curious, creative.
In today's world of everyone buying up all the data they can to train LLMs, the trust that any "simple little project" isn't doing that is gone.
A couple of sentences saying "pictures won't be used for anything and will be retained for X days" goes a long way to reassuring even if there isn't source code or any way to verify them.