Preinstalled Apps on iPads

I have never heard that MacBook's come with Microsoft software preinstalled, so that's news to me. But I can tell you no iOS based device (iPhone/iPad/iPod Touch) comes with any Microsoft apps installed.

Perhaps whoever set up your MacBook loaded Microsoft tools on your iPad for you? Here's an article I found from 2019, where it was noted that Microsoft was making their apps available for download on Mac's --> https://www.theverge.com/2019/1/24/18196087/microsoft-office-apple-mac-app-store-download

No, they don't. Those are Microsoft Apps, not Apple Apps. If you have an Office 365 Subscription with Microsoft, you can download Office 365 to your iPad.

No, those are Microsoft Apps, not Apple’s. Those MS Office apps are free downloads from the App Store, but with an iPad Pro you’ll need a paid subscription with Microsoft for Office 365.

A new iPad will have Apple’s own Pages, Numbers, Keynote apps installed.