I have participated in several bounties, I started participating in bounties in 2016, in 2017, made my first money which I considered tangible from peculium, this project paid each bounty participants about $6000 usd, funny enough, I felt I've made all I ever needed and stopped bounty till 2020, I came back again, participated in several bounties but by God's grace or luck, I made some good money from p2p cash, so to answer the question, the bounties I've made good money from are;
1. P2p cash
2. Peculium
Unfortunately, this two project are no longer relevant in the crypto market, p2p cash later turned scam, Team ran away with investors money after some months of deceiving people that they were building Stuff.
Peculium has been struggling to build something the community would accept since it's inception but to no avail.