Other cities have well developed last mile networks including fiber and copper, which are able to carry lots of traffic.
Here we have poor last mile infrastructure, with heavy usage being offloaded on networks which are not designed for last mile, such as 3G networks, hence Safaricom doing away with unlimited Internet.
In short, if you did the same here, the usage will be quite high. There's no free Internet, someone is paying for it. Unless you convince the city council to build such a network here ...