Those altcoin projects run a lot of bounties in forum. In Bounties  (Altcoins) you can see a lot of bounty threads. Not all of bounties distributed payments to participants. Very few projects gain success but let be careful with what you call as success for altcoin project.

Success can be easily considered as if a token has good pump but with altcoins, most of their pumps are traps. They will fall back especially in bear market and success in bull market will become nightmare in bear market.

I don't consider those altcoins projects with short lasting pumps and growths in one bull market are successful projects.

Dead coins: How many cryptocurrencies have failed?