There are a couple of Indian apps[0] trying to replicate Tiktok functionality. Many of them saw a surge in usage after Tiktok got banned. Not sure about the current numbers though.
The issue there was collection of massive amounts of public data by Facebook. Open data APIs can be used to build nice things, if the data isn't user information.
The difference is that if you choose to go to any URL, you can (not considering device capability and support; flash etc) from any of your devices. And what you pay to go to one website is the same amount that you pay to go to a different website as long as you use the same amount of data. Data rates being different across networks is a different issue.
[0] https://indianexpress.com/article/technology/social/mitron-c...