Internet laws allow servers to index and even hold copies of web pages to allow for more efficient servers. If servers didn't store copies then FAA servers could get overwhelmed when an image was being viewed often. Todays internet is a lot more complex then years ago. And to say "Bot" when you don't know for sure that it is really a bot is wrong also. All we know is server location that is given. If your image is being indexed updated and stored consider that a good hing. A very good thing.
If your image is linked on a social media site or blog (legal) , then when someones clicks that link the sever for the site gets its stored copy of the page. Its a lot more efficient that way then retrieving one from FAA. Then it just has to register a hit on FAA. So you see a server location not a viewer location. The server is supporting the distribution of pages that are linked off FAA. Thats how it works. Those views may trigger more visits to update the copies. Or if it is a large social media site it may store pages on servers worldwide. So you may get a visit from China or the UK or Germany also also. Get it yet? Its about efficiency and scalability. Its best to think in terms of servers and proxy servers instead of bots. This is 2015 not 2005.