Accessing the internet on Everest became a very common but extremely expensive practice after some mountaineers documented their ascent live on Snapchat in 2016. So it isn't the availability of WiFi or internet on Mount Everest that's fascinating, but the fact that it will cost nothing.
An IT entrepreneur, Tsering Gyaltsen, is to be credited for internet services actually reaching the Everest region. Writer Daniel Oberhaus shares the history of the internet on Everest on VICE Motherboard. He says,
"The roots of Gyaltsen's "extreme internet" company go back to 2001, when he and a group of young Nepali entrepreneurs formed an internet service provider called Namche Technical Support with the goal of finally bringing the internet to the Everest region. In 2003, they succeeded in their goal and launched the first "cyber café" at base camp – a 200 square foot tent populated with a handful of satellite-enabled laptops. Climbers could pay a bulk rate of $2,500 to access the internet for the duration of their expedition, or go with the piecemeal rate of $1/minute."