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Not necessarily better for the developers. If you don't have any recruiters or jobs I'm interested in, its a lot of work to create a profile and no benefit. In fact, it could just create a bunch spam for shady, underpaying gigs.

On the contrary, you'll get contacted for a bunch of stuff you have no interest in. Just like on LinkedIn if you happened to mark yourself open to offers.

Is much better as a dev to just send an app for a few jobs.

But there is close to zero motivation to make a profile if I have no idea what companies might see it.