The web is already bloated with SEO junk and megabytes of fonts and other stuff no one likes. I imagine AI will just make that process more enhanced and worse.
Ah, but imagine the level of compression made possible through the wonders of 'AI'. Instead of shipping over a few dozen megabytes in code to support all 'partners' and 'initiatives' and generally satisfy the urges of the worst offenders in the marketing department a web page now can be compressed down to a few lines, those being the prompt fed to the 'AI' in the browser:
Generate a web page showing an endless stream of photos and videos of extrovert people doing silly things with common utensils interspersed with a few similar images of cats. The page should contain 40% advertisements, 20% content and 40% empty space. Make sure to refer to the stored profile of the person viewing the page to tailor the content to keep her glued to the screen as long as possible, in case of emergency the use of real glue is allowed.