I can't help you with points 1 and 3 but for 2: do you comment on YouTube videos or upload your own? If you just consume content (like I do), you can subscribe

I can't help you with points 1 and 3 but for 2: do you comment on YouTube videos or upload your own? If you just consume content (like I do), you can subscribe to your favorite channels with RSS. Go to a channel and inspect source for "rss" to find the link. I'm partial to NetNewsWire for my feed reader.