Because you're on a device that is guaranteed to have a better mechanism of utilizing the Play Store. You can't install or update from the browser. You can't see that you even have it installed. If the site sees you are in Android in a browser, it uses a URL intent to redirect you to the app, which makes enormous sense but when some people want to cry it out.

And for all of the nonsense through this thread (again, this seems coordinated), Chrome on Android simply punts you to the Play Store app (despite people manufacturing a fiction to pitch their outrage). And, if you really care, you can set Firefox to desktop mode and happily browse it, even though it makes zero sense to do that.

Talk about much ado about absolutely nothing.