there are still some bounties that can make money even if not in large amounts and this is enough for everyone to earn additional income. So still want to forget about the bounty? even if I have expertise in finding bugs, I will never leave the bounty, at least I will get more profit, I'm greedy 
In general, he is right. All of the above professions receive significantly more money compared to what you can get in the bounty. Yes, sometimes good projects come across, but there are never any guarantees, and payments sometimes come only after a year or even more. As a developer, you already know how to do something and earn your living from this, it is very profitable. Indeed, in essence, bounty is a speculative sphere, which means that sooner or later it may not become.