The only bounties that offer BTC or ETH as payment (instead of native token) tend to be gambling or betting websites that accept crypto in my experience.

Usually they'll offer higher amounts for users with a higher rank on bitcointalk, and they usually don't run twitter or other bounties - just signature campaigns.

Be careful though, many encourage spam or are just plain annoying to see. I see a lot of useless posts from people in these campaigns and it is because they encourage sometimes 50 plus posts per week to get a few extra dollars of credit on their gambling websites.

Their focus is on gambling not crypto, so I'd avoid jumping straight into their campaigns without thinking about it first.