Have a look at the third page of this document: living-in-a-scheme-by-laws-and-other-responsibilities-fact-sheet.pdf
It specifically says that only the State Administrative Tribunal can impose fines for by-law breaches – strata companies can’t. By the way, thanks to one of the idiosyncrasies (idiocies?) of WA strata law, the owners corporation or body corporate is called the “strata company”. How unhelpful is that?
And that partly addresses one of your questions – can strata managers or the committee impose charges for doing their job? Not in NSW or Vic, but who knows in the wild west?