Calling Peertube a Youtube alternative is just wrong. It is an alternative in theory but it probably doesn't even have a milionth of the content that Youtube has.
There is no real YouTube alternative, unfortunately. The content makes a video platform great. No alternative video platform is anywhere close to YouTube in content diversity.
It's unfortunately a very different situation to most other things. For example you can "simply" convince your circle of friends to use Threema. Try convincing your favorite Youtubers to post on any alternative platform and see how far you get.
I'm not saying PeerTube is bad, but if I was a regular person that wanted an alternative to YouTube, going to PeerTube would be an annoying experience that will probably turn me off from it. You have to let people come with the appropriate expectations.
So? Again, peertube is great and I'm hoping it grows, but sending people ther as a YT alternative right now is just misleading, odyssey is much closer and even then I wouldn't call it a real alternative yet.