OHS or whatever they call it in other countries is what determines what safety gear you have to work with, from hearing protection if its noisy to hard hats on worksites, to hi-vis if collision dangers to sunglasses and sunscreen in outdoor occupations. Most of it is common sense, and you wont be entering most construction sites without minimum OHS gear. Not sure why this is so hard to understand, watch the block all the tradies have to do OHS induction. Just about every country has this.
By the way if you are stupid enough to ignore the rules and get injured on worksite you can expect some pushback for work-cover claims etc... So its nice to say how cool you are to ignore a hivis or hearing protection rule, just remember when you go to claim for that loss they will remember.
Again this site is really just highlighting how stupid people can be, just to be righteous or principled.
Masks and Vaccinations are under the health Act, not workplace OHS.