The biggest money making slot in crypto space is to be
1. a developer
2. build crypto wallets for new projects
3. find bugs in the system of many new projects
yes some paid for security breaching and all that stuff, rendering professional services is the best way to make money in crypto space now
You should understand that not every body in the cryptocurrency space have knowledge to do those 3 points you listed even if they are more paying services than the bounty Hunting so you would understand why most with no experience or knowledge of this service or even the ones with the knowledge but dont have access to doing the jobs will continue to engage in Bounty hunting and lets not forget that with some Ranks in some bounties, you could earn as much as $2k which is much too.