so how do we know that crypto exchngers dont sell us the coins what they dont exisit?
and how do we know those big funds who bought or pretinding to buy or sell some big ammounts of cryptocurrency `?
how do we know they dont lie us ?
You will not know, only that exchange know what is real happening behind . Unless exchange share it publicly which is they will not allow to happen and they will not share any sensitive information they have to public it's for security of its users that was more important to them than listing to a one person's opinion .
If you think the exchange is lying to you then never use that exchange any more.