Actually, you have read my comment again before post.
Let me make it more clear
First do you know that IE for WP uses iOS7 and Android 4.0 as its user agent to get full HTML5 features. It means IE can fool websites. As website think WP as Android or iOS device.
Which already been said by noersetiawan. But I think you haven't read that.
Now tell he how can this make Google a troll as OP is suggesting and you are are supporting.
and now the second part
If Google and many other websites do that. Doesn't that means there is problem in IE not the other websites as IE uses different user agent and websites think this as Android and iOS device yet website do not work properly.
It clearly means that problem is in IE not websites and it's actually MS fault not to build a good browser.
Example:
View attachment 108432