@The Smiling Pony  
Oh gosh, I wouldn’t wish that hell on anyone. The moon isn’t nearly as gross. In fact, it’s bone-dry, got no known organics, and is sterile (and doesn’t have gross associations like a bathroom stall does…) :q

@SPB2016  
Just as much like banishing a janitor to a bathroom stall would be.

If you think about it, since Luna raises and lowers the moon, wouldn’t be banished to be like sending her to her bedroom?

@Cirrus Light  

 
 

Imagine this being the aftermath of this:  

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your current filter.

@Maxis  

 
“It’s always such a pleasure.  
Remember how you tried to kill me twice.  
Oh how we laughed and laughed.  
Except I wasn’t laughing.”
 

 
What’s funny is this (lyrics to the song) actually happened, except it was Luna Nightmare Moon trying to kill Celestia. And Nightmare Moon actually was laughing, both times.
 

 
On a grimdark note, though, I can’t help but remember that the earliest cases of shaming with a sign like this that I can think of were || hanging victims: “Pirates beware” signs. Though I guess even way before that, they put a superscription over Christ’s cross with his accusation “king of the Jews”, || implying that shaming criminals with a sign of their crime was done all the way back then, but typically only for capital punishment?
 
I hope Luna’s not being executed, here. Celestia seemed pretty darn loving and welcoming to her return in S1E2 :p

here we go again….
 
as 1000 years ago, the story is likely to be repeated….

@CogWeaver  
They already confirmed that if she made it night for ever plants wouldn’t grow and everyone would starve, so that’s a pretty big issue.

What? Her moon is as low as it’s going to be.

This is one of the reasons why I believe in headcanon that the world Equestria’s on is [artificially] geocentric, and that the [miniaturized] sun and moon are on somewhat of the same orbital trajectory. Luna not lowering the moon would then mean destroying both the sun and moon, possibly one side of the planet, and thus and absolutely eternal night for the other side of the planet.  
Otherwise, though, as far as actual canon is concerned, I think this is downplayed as a factor and it was more Luna becoming Nightmare Moon and tormenting pones