Author here. I actually discovered something in their terms of use today while looking up something else that someone had asked me in this thread: "2. CHANGES

Author here. I actually discovered something in their terms of use today while looking up something else that someone had asked me in this thread: "2. CHANGES Yelp reserves the right to modify the API Agreement at any time. If Yelp reasonably determines that a modification may materially and adversely impact You, Yelp will provide email notice to you using the email address you provided during registration no less than ten (10) days prior to the material adverse modification taking affect. IF YOU DO NOT WISH TO BE BOUND TO ANY NEW OR MODIFIED TERMS, YOU MUST TERMINATE THE API AGREEMENT BY CEASING USE OF THE API WITHIN TEN (10) DAYS OF RECEIPT OF SUCH NOTICE." So, the 4-days would have violated their original notification terms of use anyway. I think they realized this after the fact of sending all of us the threatening emails and this is why they ultimately closed my API key after 10-days as described in my original post. Anyway, just an interesting aside that the poorly written, inaccurate original email that I shared in my original post was even inaccurate to their own policies.