Most airdrops are indeed not worth your time, but neither are most bounty campaigns. It is quite hard to find a good and interesting bounty campaign on this forum that will yield in tokens that will later be tradeable on big exchanges.
Yep. Nowadays, both bounty and airdrop of new altcoins aren't recommended to join. It is difficult for new altcoins to have a good value during this bearish season. You probably only waste time joining bounties or airdrops. But it is no problem if you want to speculate by joining a bounty or an airdrop. There should be an altcoin from a bounty or an airdrop that can have good value although the chance to get it is quite small.