Yes! It's a very simple Firebase database that just accepts a name and a score (with some encryption checks). I tried something else before but there was the problem that itch.io does not allow http requests, so I had to look for something that works with https.
oh no! No http requests?! I wanted to use this unity store asset to do what you did 😂 https://assetstore.unity.com/packages/tools/network/dreamlo-com-free-instant-leaderboards-and-promocode-system-3862