Trying to find the Rubocop yml file

I looked in the .gem and .rvm folders.

Linux terminal

I use rvm, so mine is in:

.rvm/gems/ruby-2.7.1/gems/rubocop-0.82.0/config/default.yml

You can use gem environment to find where your gems are stored, then look under there.

Found it.
Wow. 4,073 lines.