Many players from Pokémon GO think that whoever tests the game on PC is the great evil that Niantic is trying to combat right now. On the contrary, whoever tests the game on the PC is the least of the company's problems. Currently, Pokémon GO is a game full of bots and hacks with infinite money and much more. And all this straight from the phone!
Because of this, the producer started a big initiative to ban any and all players who use unauthorized methods, which even includes applications for calculating IV.
With that, unfortunately anyone who tests the game on PC, or uses the Windows Phone client, will be banned as well. Fair attitude? Not so much for those who can't play the game, either because of the location or because their cell phone doesn't support the game.
But you know what's worse? Just a little search on Youtube to see several videos with schemes on how to hack the game. And it's not about location. Hackers have already totally broken Pokémon GO and manage to get all pokémons at very high levels, in addition to infinite pokéballs, pokécoins and etc. So that Dragonite you saw in some gym, wasn't won by playing normally on the PC, it was hacked and included in the player's account completely instantly, many times, directly through the cell phone.
I've seen on Facebook, live streams made by hackers, where they provide a website and people can give their data and earn infinite pokecoins. And from the testimony of most users, it seems that the bid is real.
Apparently, Niantic has a lot of work ahead of it.