This is a bit of a follow up to Is it legal to work without pay - Canada?
When is it legal to do something and not get paid (in Canada)? Where I live volunteer work is common (ranging from helping at homeless shelters to environmental conservation efforts). Given the answer in the linked question, what prevents these volunteer organizations from getting in trouble? Often times clubs like sororities and fraternities have volunteer events.
There are volunteer fire fighters and people who volunteer at music festivals don't get paid either (but obviously there's incentives like getting to listen to the music for free). I'm a bit surprised by the linked answer.