You should always check the projects twitter, their website and their telegram channel to see if there is any activity in there. Also it is very important in my opinion to take a look at the whitepaper of the project and if it even has a real use-case or if it is just another copy and paste sh*it-coin with no real value at all. Sadly most bounties in the altcoin section are from not-so-good projects because let's be honest really good projects that have a lot of hype already don't need to do a bounty because people already know about them. From time to time there are still great altcoin bounties available though. I personally took part in the Bounty of Radix and i think that this project will still be here and successful in a few years.