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.
With the above mentioned I believe that it really takes time before you can earn a profit from it, either joining in airdrop and bounty down to make a You Tube channel and create your own content it takes time. I guess today it is better to develop a new skill set or enhance your skills that was related with technology like learn how to monetize your social media platforms, enhance your financial literacy and dive deep on how to trade either in crypto or in stocks or forex. These can be learn for free with the help of internet, it may not give you an instant profit once you jump in but it would give you a lifetime knowledge.