"... As we saw with the example of search engines, a new competitor may split an existing market ..." This is a different beast. It's consumer binary software

"... As we saw with the example of search engines, a new competitor may split an existing market ..." This is a different beast. It's consumer binary software. You have to download it, install it, tune it, learn it. The browser is now what the OS was to applications. It's just another hurdle for constrained users to jump. With search engines you just point your browser with a different url.