A motto is, by definition, marketing.
Even more generally, I worry about the trend on social media to value words so much more than actions.
The latter needs to be regulated.
I disagree that a motto is just marketing fluff. Especially in smaller companies, a mission statement can provide guidance that, in practical terms, acts as a tool for decision making for every employee in the organization (and to some extent, partners and clients)
But once they’re large enough where they could collapse the world economy if the CEO snorts a bad batch one day and decides to fire everyone, then that type of stuff is meaningless.
Culture is what you do.
It's especially useful at workplace to observe what people do and understand the politics. And at a different level observing how Google was acting more evil by the day made me completely switch over to the Apple ecosystem.