The paywalls restrict the flow of quality information, which happened before LLMs started scraping the web. If you don’t have money to spend on all of these news subscriptions you aren’t allowed to educate yourself. It’s class-based gatekeeping, plain and simple. They could tactfully include ads, but no one ever tactfully includes ads. They introduce pop-ups, fullscreen banners, interjections every 25 words, or the best is the articles that are just slide shows that take you through 30+ webpages.
Edit: I’d also like to point out that this article already has an ad at the beginning. So they are still making ad revenue even if they aren’t giving you complete access.