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Is there any documented evidence where the "do better" spell was shown to work?

Can't think of any but public shaming is warranted.

Sounds like pure self-gratification.

No, at the very least it can help surface a trend or get the movement going.

Everything happened for the first time sometime.

This one has been happening for the first time for a long time. Do better.

Naah, those who understand, do understand.

I'll do something much better, I'll stop feeding you with attention.

Sounds like virtue signalling then. No practical use.