I haven't read all that much about Kenya's internet network as yet but from what I have read it sounds like the network was mostly(entirely?) built by private business. Also this little snippet " The number of FttP connections broached 100,000 by September 2015. Most broadband subscribers are via 3G mobile networks, and increasingly via Long-term Evolution (LTE) technology."
It would also seem that Kenya had very little in the way of internet network beforehand so the improvements will of course be significant - much more so that for Australia who already had reliable internet.
