I don’t know if I’m about to say something that someone has already stated but there are a few reasons I’m aware of.
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There is nothing preventing another platform from becoming another TikTok. All of the problematic users will just migrate to some other platform that probably has less moderation and continue doing everything they were doing before.
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I’ve seen some concern about what it could do to the economy. A lot of content creators on TikTok were making money from it and some were successful enough to make a living. Some of these users have expressed that they were either unable to gain an audience on other major platforms or they were banned from them, making TikTok their only significant income source.
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There are concerns about the hypocrisy of banning TikTok for spying on it’s users when other platforms and services, like Facebook and Windows, do pretty much the same thing.
I don’t think so, YouTube’s new method for blocking third party clients seems to be difficult to work around. I have the Linux version of the NewPipe app and that seems to be working but I don’t use VPNs, so I don’t know if that would work for you.