The “original sin” is having the potential to understand ethics beyond blind obedience to the Abrahamic diety and to make decisions for yourself (to my understanding of the concept).
“Having original thoughts beyond obedience” is the original sin.
Make of that what you will :p
It’s a convenient file transfer/sync tool. Copying data has to happen somehow, I’m not surprised someone thought to use syncthing for that purpose >.<, since it can do that. But its not really different than any other tool here.