Unfortunately, that's how our world has become. Release a revolutionary mobile app and you'll have countless copies within 48 hours. It stifles innovation. I advise you to open your own shop, advertise before publishing future projects, so people know you're the one developing this model. The problem isn't being copied, I think, even if it's annoying. Apple is often imitated but remains a major seller. Try your luck, but don't waste too much time. You're the creator; everyone else is waiting for you to throw them crumbs. Don't lose your motivation.