My experience as a freelancer was one and the only.
I’ve applied for some jobs (low paying) and got one guy to fix WordPress. The job was ~30 bucks.
The chief wanted to test me first, so he gave a test job to fix some comment display issues. I said I was new and haven’t worked with WP before, still spent around an hour and a half on the test job, which it would cost him like 6 dollars, and the chef said I was too slow.
Because I accepted a job offer of 30usd, freelancer.com cut his share of the pay, and I didn’t even get the money… So working for money = giving your money to those platforms 
It could be that I wasn’t confident enough to demand more for my work, or maybe there’s only people that want to get everything for almost nothing?
I wish you good luck finding honest pay on those platforms 
