Facebook specifically had to push for an open web and just offer FB on web. Someone did a very nice clone a few years ago of a Facebook UI done entirely in the

Facebook specifically had to push for an open web and just offer FB on web. Someone did a very nice clone a few years ago of a Facebook UI done entirely in the browser and it was snappy even in lower tier androids. It might be harder for other companies, eg games where you need native code to perform well but facebook really has no excuses. They were never going to benefit from walled gardens on mobile. It could be that they lacked skills to optimise a web page, judging from how terrible and heavy their frontend apps are, but I think it was mostly a strategic decision to go native.