Bug bounty is the only available bounty for PolkaDot, but i actually see you are promoting PolkaDot in your signature. I searched about PolkaDot signature campaign but found nothing. Did you create this signature by yourself and start promoting without waiting for a reward?
I guess he did, he mentioned that he has skills so it could be part of his skills and that is to create signatures and code it. And as support for Polkadot, he made one.
I believe that investors of Polkadot ICO where the very lucky investors since the ICO was launched few years ago. How i wish that there's a bounty for this project but i found nothing except for their bug bounty that is far beyond my skills. With a project such this that is well funded and with so much hype, i can only hope less for them to offer bounties like i used to participate in this platform.
They are lucky just like any investor that have chosen a project to be good and resulted to have a successful run. And after that run, they've got in to the top because the developers have maintained its status. Nothing new with successful projects and lucky investors. If somebody invests to a successful project, he deserves to have it as he have took risk investing on it.