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"sustains itself" is correct and usable in written English.
You can use it when referring to something that is able to continue on its own without any external help or support. For example: "This company has developed a system that sustains itself with minimal external input."
Exact(54)
So the online campaign sustains itself.
"It uses energy, it sustains itself and it replicates".
It needs to be a business that sustains itself".
"It's a macroeconomic play - that this thing continues and sustains itself, which we think it does.
"The armistice sustains itself in part because the parties recognize they can't make gains by fighting".
Unlike the BBC the channel sustains itself through the sale of adverts and other commercial activities.
But this is not an idea that sustains itself easily anywhere.
Similar(4)
"How can the industry sustain itself?
Without subscribers the opera cannot sustain itself.
It can't sustain itself.
Passion can't sustain itself forever.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com