How do you guys feel about when youtubers make "precons"?

Many times, usually because there are 2 or less precons and they want a full game, a youtuber will create their own versions of precons. I think the idea is really fun and interesting, and love to see how they think a precon would look like.

My only complaint is more often than not, they add cards not within the set. It is a small complaint, but I feel precons should be all cards of the same set, as (as far as I know) all official precons are the same set or universe. Or if they are clearly not matching power to offical precons of that set.

What are your opinions on it?

Edit: turns out I was wrong and precons do often include non set cards. Oops lmao