> They realized it didn't matter and was more beneficial for them so they can scoop up more public domain and make more movies out of it. I don't have anything

> They realized it didn't matter and was more beneficial for them so they can scoop up more public domain and make more movies out of it. I don't have anything concrete to back this up, but it seems more likely to me that they just don't see much potential revenue in content from the 1920's, so they see little to be gained from further spending on copyright-extension lobbying. Put another way, they've already succeeded. Copyright terms aren't actually unending, but in profit terms (or practical terms more broadly) the difference is minimal.