This is not unique, Coinbase and others still use legacy addresses formats (which means higher fees for the user).
Coinbase has bech32 for a long time already. And they batch withdrawals and doesn't charge high tx fees from the user.
Really? The Coinbase BTC receive addresses I have seen are all in the legacy format: https://help.coinbase.com/en/prime/trading-and-funding/address-formats
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Not sure about Coinbase Prime. Cannot also now check about receive with ordinary Coinbase, as my KYC has expired, I can only send. But when looked at their batched transactions, their internal address were bech32.
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When they send out, they do batches.
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