Mr. Robot; showing the worse of humanity, how far people will go corrupting once held morals the whole way. Not being able to understand oneself or the people around them, but still wanting and hoping to see people enjoy life.
I believe the series ended on a great note, though some may disagree.
I use a userscript that will like a video (even if not subscribed) if I watch at least 80% of it. As for commenting, it really depends on the topic. Like, if someone needs help on a tutorial, yes. General videos like PewDiePie, no.
As for subscribing, a channel’s content must be interesting and not feel corporate. It always feels good when you find a new youtuber you like!