A plugin that can remove the ingame map, or blur it out so players can't read it.
And remove the compass in the top of the screen too

let's me know 

No one?

I've heard of plugins that try to do this by creating large circle map markers. However, I've also heard that there is a split second after opening the map before the markers render, during which time the player can see the map. Players might be able to spam the map key to see the map anyway basically. This may also be an issue when using map markers built into the map itself. Also, cheats could definitely hide the markers if coded to do so.

Have been thinking of making a "hardcore" server. And on that one I cant to remove the map and the compass.
I guess there is no way you can unbind the G button for player?

You cannot do that.