If anything, their wealth makes them incredibly powerful allies. They have influence and they’ve been able to take a closer look at the process. The actors striking gave the writers a much needed boost. It’s corny, but I saw a meme for Avengers Infinity War which portrayed the writers and the heroes struggling against the invasion in Wakanda, and then SAG leadership was Thor coming in and turning the tides. It’s obviously a joke, but I think it fits fairly well as an analogy. The Screen Actors Guild is a massive asset.

The investment accounts are an interesting point though. With how it works, a lot of Americans technically own little bits and pieces of the means of production, but not enough to influence things. I’d argue the famous actors probably don’t have much influence either as investors, despite having a lot more invested.