What is the real reason Google removed its “Don't be evil” motto?

My guess, their legal department plays a bigger role now. They might sense some potential liability with that motto if they do something wrong.

It just didn't fit with the decor in their Evil Overlord HQ.

It's still there..

Moved to the bottom as the last thing you see: https://abc.xyz/investor/google-code-of-conduct/#:~:text=And...!

Having to uphold some idealistic image when operating a normal business is just a recipe for terrible PR. In particular as the company grows massive.