This article would be very useful for newbies, but there are many ways described in this article not that useful. Anyway, i believe the best way to earn bitcoin are through trading and participating in bitcoin signature campaign.
Faucets,airdrops and bounties are not useful anymore,we just have to stick with bitcoin to earn bicoins without any capital or can be more profitable through trading it.
There is no way you can earn bitcoin without capital, the only way is if you work for it and you are being paid with it, I agree with you that other methods of earning cryptocurrency are no longer fully functioning.
Nevertheless, we still have some of them that are working, after all I participated in an airdrop some weeks back and I got up to about $120 from the airdrop. What I just do is to make sure I do research on all airdrop opening before any form of engagement, it takes time though, because you have to scan through majority of the airdrops we have before you can finally find one.