Do you really think those purse_N mnemonic phrases are generated by exchanges themselves?
I think they are more likely just linked to the blockchain and send the generation trigger with front-end to Monero wallet
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no, exchanges generate themselves
it's an easily-embeddable leverage taken directly from Monero blockchain
there's the issue with privacy on exchanges however
no matter what exchanges generate, when it happens on the level of Monero blockchain, the seeds and addresses are mixed, so the real sender of money is always untraceable