Given a full permission to /etc/matic/ directory

Hello there,

I am working on seting up a full polygon node. I came across a step that is about giving full permission to the metadata file in /etc/matic/ directory using this link : Full Node Binaries | Polygon Technology | Documentation
How is this safe?

Also, I got confused on the next step: Setup config files Full Node Binaries | Polygon Technology | Documentation

It says “Login to the remote machine / VM” and on the prerequisites section, it says " * One machine is required."

Thank you