Actually you can participate in the bounty, I plan on doing so and am right now! The only issue is as new members we won't be eligible to receive as many stakes as other users. However, if you believe in the project and the team, any stakes you can get is certainly only a positive. I'd suggest taking a look through all their campaigns and checking if there's anything you are able to participate in. I'm doing the signature campaign and looking into the Reddit one as well. Hopefully you can find something!

Best of luck