I don't like "passive income" in your subject name

You need to be rather active if you want to help the project and earn more stakes. Helping the project must come first, otherwise what point of having useless tokens. Some people manage up to hundred bounties doing the bare minimum and spamming this forum. Personally, I would never join a signature campaign asking to write 20-30 post per week. I cannot do that much without writing some 1 liner bullshit.
But airdrops, with rare exceptions, are waste of time, most of the time you're getting peanuts. Ontology was quite different, people got 1000 tokens just for subscribing to the news. Telegram airdrops are a good example of time waste. 5% of bounty pool (usually 1-2%) is allocated to telegram. But those groups quickly reach 20-50k members, making the individual share worth nothing.