The question a judge (or jury) would answer is: would a reasonable person think they had permission to access it? API documented on the website under a section

The question a judge (or jury) would answer is: would a reasonable person think they had permission to access it? API documented on the website under a section called “For Developers”? Probably, yes. API reverse engineered by intercepting requests? Probably not. Note that the blog was taken down before I could read it myself.