The WiFi we usually say should refer to the WiFi hotspot, another name for the WiFi hotspot is AP (Access Point). There are many types of aps, mainly divided into domestic aps and commercial aps. There are differences between home AP and commercial AP in supporting concurrent users and bandwidth management. The most common home AP is a wireless router at home, while commercial AP is generally deployed in crowded areas such as conference centers and airports.
There is free WiFi on buses and buses, in fact, there is another name MiFi, which can be understood as mobile WiFi, and the corresponding household AP and commercial AP do not have mobility. In layman's terms, MiFi allows you to still have a good Internet experience on a bus at 30km\/h, which is not possible for home AP and commercial AP.
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The reason for this difference is that while home and business aps are connected to the core network (the data center where all your Internet access is stored) over fixed broadband, MiFi is connected wirelessly to the core network over 4G. The MiFi is actually a signal bridge that converts 4G signals into WiFi signals for people on the bus to use. Home aps and commercial aps convert fixed broadband into WiFi signals, and fixed broadband cannot run on the street.