Earlier quoted context omitted.
So now I can script a bot to book restaurant reservations all over the city at busy times. Then nobody shows up for the reservations, the busy time has passed, and customers have moved on or gone home. Restaurants make or break on one or two nights in a month. A calculated social engineering attack like this could bring down hundreds of restaurants in a city, which would cause millions of dollars in lost taxes, and y…
Was there something stopping you from doing that before? A lot of places you can even do it online.
You could write a screen scraper to book online through the various booking systems, but each booking system probably has its own restrictions on how many accounts you can have and how often they can book. You skip all of these protections when you phone your reservation in (arguably, the restaurant staff should be enforcing these protections when they pick up the phone, but restaurant staff are often overworked and apathetic).