Yes, It's true freelancer.com has become the largest freelancer site but It's true too that it has the worst quality jobs available. I paid 3 months "professional" subscription for nothing.
This subscription allows you to make 300 bids in a month but I used 10 as much each month because the work is for pennies.
The "jobs" are things like "want to hire some whatever" without no more description and paying $20.
And then, works thousands dollars worth are required to do in days and at small fraction of the real valuation.
This site is more an offshoring and outsourcing job marketplace that must be reviewed and controlled by authorities.