I agree with you, whether it's for bounty or trading, I believe the crypto-market is too volatile to trust on a daily basis.
Maybe as a bounty manager, as I've heard some can get paid in fiat.
True, bounty and trading is only suitable we make as a second income, making bounty and trading for the main income and leave the main job will make us depressed because the market is very difficult to guess.
unless he is a high-skills person in trading and he can analyze the market with easily and he can earn much money from the market in any condition, then he can leave his job and focus in cryptocurrency. but if he doesn't have any skills and he is a new person in cryptocurrency then this is a good idea and it's better to stay with his job and he can keep trying to make cryptocurrency as his second source income.