Don't know much about syncthing, but it never seemed to work the way I thought it should & was just a massive let down after bittorrent sync suicided itself. Keet & pear work the way I have always imagined things should work.
Discussion
It shouldn’t be synching, it should have more in common with syncthing. Meaning, it should have more in common with Secure Scuttlebutt. Meaning, relays don’t store data. Clients do.
And that data is from your network alone, or one hop out. All relays do, is facilitate discovery.
As for pear, I’ll have to discover that myself. Something weird about it…