Everyone vs all (Everyone is doing that)

[Daemon99]

I know that the sentence 'Everyone is doing that' sounds more natural.

But is 'All are doing that' also natural? Is there a situation where we can use it?
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Non-native speaker of English
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I intend to live forever - so far, so good.

[Jamie (K)]

"All are doing that," sounds unnatural. I suppose that there are very rare cases when it might be possible to use it, but I can't think of any right now.