That was unfortunate but not all bounties are waste of time I will name 2 of them I recently joined , temtum and minter all in all I earned almost $700 from this two but it took 5 months but not bad for an extra income right? If you want to make sure it will not be a waste of time you have to research first about people involved from bounty manager up to team members and the scope of the project and btw yes OP is right skip social media bounties its not advisable nowadays.