It is better to not take the risk, I know that the idea of passive income and getting bitcoin in return is very attractive but most of the time that would require to let go of our bitcoin and let someone else have complete control over it.
Yeah, as bitcoin world is relatively new and the interest yielding registered ventures are not available in most countries, I agree it would not be worth to risk our bitcoins with non-established opportunities. Still I do see many attractive luring promises everywhere which are paying higher interest rate than my banks.