Can you name one other personality with a large following that comes even close to Louis Rossmann in bringing stuff to light and fighting back against enshittification?

Well, there’s Corey Doctorow, of course. He literally wrote the book on Enshittification.

There are definitely more “behind the scenes” folks doing a lot for that particular cause who don’t so much have a following of anywhere near the same size, but nonetheless do fight enshittification in big ways. Bradley Kuhn comes to mind.