The MFT has the ability to join a Wi-Fi network like you'd find at a McDonalds or Starbucks. The limitations are the SSID has to be visible (no way to join a hidden SSID) and as mentioned before, the Wi-Fi's password can't have more than 10 alphanumeric characters.
Once joined, your Escape can present its own Wi-Fi network that your devices can join automatically. Why would you want to do that instead of joining the free network directly? It's easier since once your devices are configured to connect to your Escape, they'll rejoin automatically. Depending on the Tech capabilities of your passengers, it may be easier on you.
I guess it depends on your data plan. If you can use your phone's data plan and pair your Escape to it without exceeding your plan, that's great. But sometimes you might need to mooch some free data to avoid exceeding your cap.