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>Well if you believe this we can go the extra step and assume that the exchange is _causing_ the wallet "maintenances" to run up the price of a coin they want to sell to their customers.

This isn't hard to believe at all. In fact that sounds like a pretty tame level of scamming for the crypto world.

Crypto "exchanges" have a long history of being difficult about withdrawals. Search for "bitcoin withdrawal problems".

And we can go a step further yet by assuming that the reason they want to sell that going to their customer is that they're buying it elsewhere. They're doing the arbitrage.