I'm wondering this because is such a real threat to bank system and we all know how banks and governments are tightly linked !
BTC could make people more autonomous, self-resilient, being their own bank. You can use it like cash, making your transaction almost untraceable (or untraceable using e.g. monero or dash or laundry systems) : this is governments worst nightmare, isn't it ?
The governments dont understand yet, that BTC is a pump&dump scheme on the top of pyramid. Thats why.
This is a compliment to BTC, meaning its complicated scheme.
But on the other hands, governments fail to limit even very clear schemes. For example proven ponzi/pyramid Kairos Technologies is forbidden only in several countries around the world.