Hi there - I'm the CEO of Gun.io. Shoot me an email at teja[at]gun.io. Our average rates on platform are 10x higher than that. In fact, that's why we started the business.
I remember I applied and after emailing team@domain ~1 year ago and didn't get back a single response. Hell, I even found a github profile who said he worked there and emailed him too and no response. Still have the emails, you can search your inbox with the email in my profile
Depending on how good you are on the thing you're applying for you can get jobs as much as $60/hour (only tested upwork). You also have to apply some country filtering, don't hope to get paid $30/hour by some Pakistan company. Higher than that is really difficult.
But there is other coin too, once tried to hire some `solr` experts ($100/hour rate) whom after I asked about some extension development went out of touch (1 agency & 2 contractors). So it can suck on client side too.