There are plenty of social media scripts out there, some offering many of the features of Facebook, so people could technically start a social media site with a minimum investment of just a few thousand dollars (the script price + the hosting price + the domain), but that would only be a website accessible through a browser. Developing apps and having them approved by Google and Apple in their app stores would cost a lot more. And there are cases in which they downright reject the apps of some sites because the sites support ideologies that are not popular (e.g.: Gab.ai). Do you think it is possible to create a popular social media site that doesn't have mobile apps, and can only be accessed via browsers?