Actually the scale is larger than that. Amazon got over 100 cities to bid on the project. Entered into deeper negotiations with at least 20 of those. Got many cities to spend hundreds (or thousands) of hours putting proposals together, pitching teams, crunching numbers, offering deeper tax incentives than anyone else can get. In the end, they chose the location they were going to choose anyways.
So it was a colossal waste of time for 5,000+ people across North America. Burnt a lot of goodwill. Many cities learned a valuable lesson on dealing with these big multi-nationals as a result of it. So it won't likely happen like this again.