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About digital coins.

Can you please explain what does it mean "to keep their costs"?

These platforms charge some money for every transaction they do to keep their- operational costs and to make a profit.

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anonymousto keep

That's an usual choice of verb. I can't imagine why they wrote 'keep'.

to [reduce / limit / cut] their ... costs

CJ

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anonymousCan you please explain what does it mean "to keep their costs"?

I am guessing that you misheard, and they said "to recoup their …."