Trump supports people who make him feel good and hates people who make him feel bad. He isn't pointing the DoJ at big tech. He is pointing the DoJ at people who make him feel bad. Trump thinks that YouTube (and Google more broadly) is unfair to conservatives and is full of whiney liberals.

You won't see consistent application of Trump's DoJ. It'll just be a hammer that he can swing at things he doesn't like.

It could even be the case that many of the things that he swings the hammer at will deserve it. But there will be similarly deserving people, groups, and organizations who get off scot free because Trump isn't personally angry at them.