Generally speaking, I think people have gotten a bit... too excited with the making of videos online. That they do in fact get carried away with their thumbnail choices, video titles and so on. This has come with noticeable pros and cons.
The cons are obviously that it's become virtually impossible to follow games online now in the active sense without getting them ruined a tad before the first impressions can really develop. Sometimes without even seeking any out! I firmly think that we're witnessing a cultural shift in times where what used to be supplementary is now trying to replace personal gaming for a lot of people and I find it highly unfortunate.
The other issue I was describing outside of that was just misleading narratives and depictions of games. Because games are more popular than ever, people have started to inject them with various politics, takes, views etc that seriously affect how certain games are perceived and will ultimately discourage people from seeking them out.
"Also, do you think there's any distinction between videos that just walkthrough the game with no commentary and videos that do commentary over them? Do these two types of videos present different issues/problems for games and developers?"
They do not. (It is less to do with long-term presentation. The absence of commentary also has more to do with copyright/legality, which is not the main focus of the topic at hand.) With them it usually comes down to preferences and there is a market for both types of videos from what I've seen.
I been there and done that. I seen old 2011 horror tube and the humble beginnings of these videos. I been there to witness the change in the times and I suspect we yet to see some of the biggest within this decade.
Hope this was at least somewhat insightful. I had a really bad day and feeling a bit messy atm.