It’s not a “bold claim” to say that something that may or may not be undesirable (wealth concentration) is different than something that has been illegal under our laws going back to Biblical times (stealing).

Also, the whole “robber baron” thing is distorted: https://fee.org/articles/how-the-myth-of-the-robber-barons-b.... By and large they became wealthy because they provided an incredibly valuable new service that catalyzed vast amounts of new economic activity. I suspect 50 or 100 years from now, you’ll read similar revisionist histories about the dawn of the Internet age. The proponents of central planning are already working on it.