Syncthing runs on computers you own, not a centralized server. I'm not sure where metadata would be leaking, considering communication is encrypted.
Discussion
You're broadcasting it.
If you're worried about your IP address being known disable global discovery and have your devices on a VPN. Wireguard is good for this.
I just said to beware.
also I use syncthing
It's a valid but trivial concern compared to the spying one deals with on gdrive, OneDrive, etc.
Thankfully there are solutions. People who are capable of using syncthing probably already have a VPN set up anyways IMHO 😂
given the dostr DM discussions I just found it worth mentioning.
also, what's VPN 🤪