I've never even bothered with them. My freelance jobs have come through my personal network and various slack/skype groups. Your goal should be to find a few (

I've never even bothered with them. My freelance jobs have come through my personal network and various slack/skype groups. Your goal should be to find a few (1-3) clients who consistently have work for you and are willing to pay you daily or weekly. Take those relationships seriously, work hard, and give discounts when you fuck up or seriously overshoot your estimates. If you're good, they'll come back for more.