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Both companies have to keep evolving to stay relevant, yes.

One is declining and reviled, and the other is growing and seen as fun.

That’s the only difference.

But one sits on a mountain of cash and the other on just a hill

I guess you are not aware that TikTok is both highly profitable and valuable.

But it’s not Facebook size yet

Don’t you mean Facebook isn’t TikTok’s size yet, since Facebook is declining both in revenue and users.

Full support of the PRC is more than a "hill"