MacOS Big Sur isn't available anymore

Greetings,

This may be just a temporary thing but MacOS Big Sur, MacOS Catalina and MacOS Mojave were all removed from the App Store to download and only MacOS Monterey is still available to download. Even when I go to the official Apple Support page to install the older versions, it doesn't work, by that I mean the links aren't working.

This is the Webpage:

https://support.apple.com/en-us/HT201372

And this should be the link that directly links you to the App Store with MacOS Big Sur:

https://apps.apple.com/us/app/macos-big-sur/id1526878132?mt=12

but it doesn't work, even on safari it doesn't.

May anyone give me an explanation?