Then they all need to go find somewhere else to work.
If Yelp had no staff because they offered below the market rate for labour then they'd quickly have to improve their offer.
And just to head off the socialist nonsense..
if there's a queue of people lining up for that job, then they ARE paying the market rate.
Bottom line, there's absolutely nothing wrong with making sacrifices to live within your means. Western Australia is very expensive for accommodation and it's very common for single income households (i.e. individuals) to share houses to keep the costs down. Should I whine to my employer about it?