As you surely know, WhatsApp already has this feature ("Live location"). I'm not sure that it's E2EE in WhatsApp, but I would say so. What does Zood Location offer over this? There's value in having a minimal app for the sake of it, but I would expect your userbase to be a small niche for consumers. There might be better vistas in B2B. See also this comment: https://news.ycombinator.com/item?id=25354165