X doesn't have its own browser, and neither do Instagram, TikTok, Reddit, nor LinkedIn. YouTube is basically a part of Google, and it's a good example of anticompetition when they deliberately degrade the performance of their site on non-Google browsers: https://news.ycombinator.com/item?id=38345858

All of them have dedicated mobile apps. X even has a desktop app. These platforms stand on there own and are not trying to replace Chrome. Their apps are for their own platform and not the web platform.

Also the post you linked to targeted users of adblockers and affected Chrome users using adblockers.