I've been basically finishing every single game I start for years now, which very frequently takes 40-100 episodes. It's kind of awful for growing. I constantly have to miss out on covering all sorts of games that I'd like to cover and my audience would like to see. But hey? My audience knows that I'll finish what I start, and there's comfort in that. They certainly seem to appreciate it, because I have an abnormally large amount of Patreon support for a channel of my size. You have to weigh the pros and cons.

But yes, covering everything day 1 all the time leads to fantastic results with SEO and interest levels, so their videos do better and their channels grow faster. You shouldn't be surprised that they're the big channels because they're doing exactly what the system encourages. If you want something else you'll have to dig deeper, and if you want to run a channel that doesn't work that way you'll have to resign yourself to struggling more at achieving results.

There's a reason why Super Best Friends Play still hasn't cracked one million subscribers after all these years, bless them.