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.
If they are interested in the same and useless bounties of others it may damage their reputation that is why they tried something new which need real skills to participate and also the bounty itself is going to be very helpful for the development of that project.