My understanding of volunteer in the context of strata and insurance is say a lot owner who takes the bins out and in, for no pay. He is volunteering to do what could normally be a paid job.
Once a lot owner starts to be paid for a service, he is not a volunteer.
The next consideration is whether he is an employee or a contractor. There are entire websites devoted to debating this conundrum.
Not with standing whether the lot owner ( it could also be a tenant ) is a contractor or a volunteer, the committee needs to consider what risk there is in the task. Carrying bins out probably represents a low risk to generate a public liability claim. Changing lights when up a ladder is more risky, but could still be beneath the threshold where insurance could be demanded.
With the cost of tradesmen and handymen, and the difficulty in getting them, it’s worth the OC considering using such resources provided there is a cost saving to the OC.