I would put a * mark next to YouTube, Airdrop and Bounty. Because some time mass pass before a persons starts to earn from it. It might pass months before bounty rewards will be distributed, not to mention that rewarded altcoin must be traded somewhere. With airdrops it is even worse. They rarely being distributed, cost something. And most important - you need a starting capital of couple of dollars to make first transaction of reward to exchange.

With YouTube it is more complicated. First your need to create a content that will really be interested to people. YouTube is so full of everything, and it will take time before you get your first 1k subs and 4k views/monthly. Only after you get connected to YouTube payment and start getting 1$/1000 views, you will have to wait till you get $100 on a balance, because this is the minimum withdrawal amount.