It is said that never reuse an address, but the news is stating biggest bitcoin addresses are buying?
This is mostly about privacy

Because they don't care about their privacy

Because they don't care about their clients/customers/friends' privacy

Because they want to keep their code simple

Because they don't want to keep a database of their addresses

Because their identity is already obvious: This is the case for exchange wallets

Because multisig addresses whose transactions require mulitple private keys to be signed are one each and I'm not aware of a &quot;multisig hierarchical deterministic wallet&quot; system. Multisig addresses are intended for reuse, at least until someone finds a way to solve this