Just gonna leave this here...

https://www.gnu.org/philosophy/free-sw.html

As I understand it Sync could charge for the app with a free software license, but wouldn't be able to stop people copying or distributing it.

Not being able to admit when you are wrong.

Also not apologising. For example when people don't say sorry for being late.

I don't know if you mean on linux but in my experience I have found the bottom part of the first man page usually has a section on config file locations.