Well, of course it already exists.
Your really think you’re the only person on the entire planet that has at least tried to do this? It’s the Fermi Paradox of Start-ups. Of course they have. But — it doesn’t mean it matters. Not if they aren’t at scale, or at least getting there, yet.
I suggest the “2-60-Google Rule”.
If two of you spend 60 minutes on Google each trying to find a competitor that is at scale. If neither of you can find anything that looks like a real start-up … then don’t let this stuff worry you.
What that probably means is there isn’t a huge competitor than can stop you. And of course, there will be tiny competitors.
There always are.