Even if that is how it’s working, it’s up to the website to send that command. The app isn’t looking at the URL you enter. That’s why you can force the browser to go to the desktop version of the site to actually get it to load. The URL is the same. In any case, the company controls the app and the website. It’s on them for how it works.

And even if you prevent it from loading the app, there’s probably still not going to be a website to load.

It’s annoying because it’s the default functionality, not that there is no way to get a website to load.