Class B shareholders can do anything they want that hurts class A shareholders, so long as class A shareholders can't successfully sue. 67.8% of Fortune 500 companies incorporate in the state of Delaware[1], largely because Delaware has a Court of Chancery that handles corporate cases and is renowned for making shareholder lawsuits unsuccessful.

[1] https://www.legalzoom.com/articles/incorporating-in-delaware...

There’s no evidence (in the article) that any shareholders were harmed.

Businesses pay money to settle legal issues all the time.

The larger payment settled the issue (with the Federal Government). The smaller alternative would not have (according to the article).

In the end some shareholders disagree with other shareholders.

And anyone can sue anyone.