To be fear, they did not just publish a negative blog post about WeWork as the title may suggest, but somehow obtained proprietary data WeWork probably sees as a trade secret.
Many companies will revoke your access then.
Many companies will revoke your access then.
Where's the line between "scraping" (prohibited) and reading (allowed) of the API data?
I think the logic to that is something akin to: its illegal for you to take my car even if I leave it unlocked with the keys in it.
In this case, WeWork is within their rights to terminate ThinkNum's membership for the ToS violation, but there's no legal case unless ThinkNum persists in scraping WeWork's data after the termination, or there's evidence that ThinkNum knew that the API was restricted at the time they accessed it. Hence the founder's repeated insistences that he did nothing wrong, and coyness in discussing the source of the data.