Sometimes the contest results are delayed due to snags behind the scenes. The contest is still ongoing.
The payout from the contest is via some weird oldschool web 1.0 payments provider called globalewallet.com. There are fees for withdrawing. There are fees for not withdrawing. But for the most part it works fine. I ran into snags and it took a lot of back and forth to get it resolved, but my situation is a bit unique (but it was entirely their fault for not being able to handle it). In the end it worked out just fine. You'll get emailed the instructions for how to log in once you've earned any money. You'll have a dashboard where you submit tax documents and can withdraw your balance to a bank account, credit cards, or even bitcoin.
The contest is separate from the Q Fund. I believe Quantopian will get in touch with you if they are interested in licensing your strategy. My impression is that they are somewhat secretive about the terms.