Why every new social media clone looks the same? I don't know much about large scale projects, but wouldn't hosting videos become a huge cost in a project like

Why every new social media clone looks the same? I don't know much about large scale projects, but wouldn't hosting videos become a huge cost in a project like this? Many social medias didn't have video support until they were huge. In fact, I think Plurk still doesn't support it, even though it has existed for 16 years. But the other day I learned about this "TikTok" thing that is video-centric, and that there is a clone called Kwai, which is also video-centric, and that everyone seems to want a platform to share videos for some reason.