Most of my web browsing is using Firefox on Qubes OS with a Whonix gateway and much of my BTC transactions are done using TailsOS on a USB drive (thanks @DarthCoin). Both setups use tor for accessing the internet. It seems that many bitcoiners prefer online privacy, especially when transacting with their bitcoin, and therefore are using similar setups. Your current configuration forces people back out on the clearnet to access AirBTC's web site.