Can LE tell what addresses are DNM wallet addresses on the blockchain, how?

Just wondering because I've heard stories of accounts on Bitcoin distributors getting closed because they noticed that bought funds were being transferred to markets. How would they ever be able to tell what's a market address and what isn't?


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[3 Points] al_eberia:

The markets will sweep coins from deposit addresses into central wallets so that they are easier to manage. There are a number of companies that make frequent small deposits to the various markets to map out these central wallets. When they see other addresses sending to the wallets they know that the coins in them were deposited to the market. They sell this data to various bitcoin companies that need to cover their asses.