you can certainly earn a bitcoin in a bounty within someone so you can start it up and your rank is high because if you start it and your performance is much bigger you can get it.
A bitcoin even for a legendary is like a tale nowadays. It's unlikely to see a high rank member to earn that amount. There's too many factor to consider.
- if the project is good and legit, expect that the many participants will share the pool
- hard to see a legit project that will pay with real money (worth it tokens)
- you can earn few satoshi's / mbtc's but one bitcoin is impossible