What could be the reason for all this government pressure on people not to mining bitcoins?
They don't see it that it will help their economy. And the most popular reason is that it's being used mostly for illegal trades and that's where they are still leaning on for that reason.
That's why some countries don't like it because that's one of the uses that they only know about bitcoin but they ignore how far bitcoin have went already in this world and after all of those years.