~~
same as bounty now days. very few projects are willing to pay hunters. so i would like to invest my time there. thank you for your valuable feedback
It's not like a bounty, a bounty is a campaign announced with a certain amount of bonuses before the campaign launch. Those who participate in the bounty campaign when completing the quest will definitely be rewarded. But unfortunately most of after bounty campaigns are over, project developers have scammed people, not paying hunters, they are scammers.
As for the testnet, they do not announce that you will receive a reward for participating, but you join on a voluntary basis, they have no obligation to pay you after the testnet ends. it's called a tribute gift for early users, not a mandatory task like bounty campaign. So guessing which testnet project will pay is based on each person's experience, as there is no any advance notice.