Yes. You can use a WiFiBOX installed at a hotel or café even if you are not staying at the hotel or using the business.
You can enter and use the WiFiBOX
You may enter the hotel or business and use the WiFiBOX rental station.

Hotels and businesses are informed in advance that WiFiBOX customers may visit solely to use the rental station.
Free Wi-Fi may not be available
Depending on the location, free Wi-Fi may be limited to hotel guests or paying customers.
A temporary internet connection is required when picking up your WiFiBOX.
Please use your smartphone's mobile data rather than relying on the hotel's or café's free Wi-Fi.