In case you're planning to learn about business insights, Marc's successes and failures leading Salesforce as a business, anything about building / shipping great products or even about providing top-notch customer experience, then you're gonna be deeply disappointed.
Befitting to the book's subtitle - "Power of business as the greatest platform for change", it talks about the social standings Marc has taken publicly, using his influence as the CEO of one of the largest companies on the planet and his values around which he tries to run Salesforce and cater to his employees and customers.
In the book, Marc has portrayed himself as a big believer of social causes and has emphasized over and over again why it's important for people in similar positions to be the leading voice against such issues and the larger benefits standing up for these causes can have, both for your business and the employees who work with you.
I'm really not sure how much truth is in Marc's words in here but if there is, then I don't see why or what reasons could other large businesses have for not following suite to Marc's advice and ways of running a business, driven by values and strong beliefs.
I wouldn't recommend it to everyone. Only if you're in a position to influence change, be it if you run a company or hold a higher authority position in the government, then you should get your hands on it. While there were a few instances on how small groups of employees of Salesforce led Marc to take some radical decisions, these issues were not something difficult to comprehend to understand their repercussions, case in point being, gender diversity & pay gaps.