Except when said web site detects your mobile web browser, and serves a page telling you to download their app instead.
Which makes Firefox the obviously better mobile browser, Chrome seems like a pretty strong case of defaults' power. Tho gotta add the "Google Search Fixer" select addon because they sure doesn't want you to get summary cards, financial charts and other goodies if you use a competitor browser.
Google, YouTube, Facebook, Instagram, Twitter and co without the ads circus. Duolingo without daily activity limit for some reason.