The RCC adds burdens on people, claiming they are from God. That’s what Proverbs is warning against, not merely adding the Bible itself. This is what Paul warned against in Galatians 5:1 Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage. 2 Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing.
Absolutely not.
You mean like Baptists who condemn dancing, smoking, social drinking, and mixed-sex swimming?
Those burdens would, of course, be directly revealed by God in the clear words of Scripture, right? Maybe in the First Letter of Paul to the Confusions, around chapter 4?
Protestants haven't a leg to stand on when it comes to adding burdens on people; they do it all the time and have for centuries. Ask the Puritans about all the freedom they'll give you to celebrate Christmas.