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You aren't comparing apples to apples with those numbers. Bing has 100 million active daily users. Apple has about 2 billion registered "active" devices, which means they were used within a 30 day period. In this case, you are comparing daily active users for a particular service with monthly active users for an entire device. It's not clear if any Apple service reaches a lofty DAU.

Apple hasn't released daily active users for any of it's services, but it has argued recently that iMessage has less than 45 million active users in the EU (https://9to5mac.com/2023/09/04/imessage-app-store-gatekeeper...). Meanwhile, some estimates put Bing's monthly active users over a billion.