There's a return to the person who made the report, because their name is stripped off. It's the same as what happens with SECURITAS at the Transportation Safety Board.
They return a report to the individual on the outcome of the investigation. They will advise the interested party, such as Transport Canada and/or the company involved, of the outcome of their investigation, but at no point does the regulator--or even the aircraft operator--know who filed the report. That's total anonymity.