Stripe hasn't been "just a payment processing company" for quite some time.
An optimistic view of this move is that it fits in well with their mission: these books could, in theory, inspire, educate, and motivate people to build or grow their businesses.
A more cynical(1) view is that this is simply more elaborate content marketing – getting Stripe's name out there to people who are interested in this content, who are overwhelmingly in Stripe's target market.
(1): Cynical in that it's less feel-good, but I don't at all mean that this is a bad thing.
Under that banner, releasing content aimed to help businesses be more successful is totally aligned with their goals.
They're not. They make and sell cars, and Stripe is a payments processor.
In 5 years we have had exactly one chargeback.
I am excited about nice books, but I am more excited about Stripe using some of their growing market clout to attain lower fees.
Fine, okay, maybe sometimes the diversity argument gets annoying and stale, but seriously‽
There's a reason publishers exist. If they're good, they have enough experience to not be so myopic and tone-deaf.
That’s a stretch. Publishing has been dominated predominantly by white men for a long time.