This has actually been around for a long time. Long enough that some sights you do pay for their services of prequalifing you and keeping a sight that draws in people that needs freelancers. Let me mention that is what you are paying for and not for the jobs.
You can navigate businesses and look for free lance for your work, but it is a lot of hard work to develop the relationships to make it.
Either way will work, you just need to do it, and stay strong in going for it.