Psst. You can use Bitcoin for whatever purpose you may see fit. You want to use it as an investment? A payment currency? A way of having real ownership over your money? A way of hiding your wealth from the government? You may even use it to buy those anime waifu pillows or Belle Delphine's bath water and I don't care one bit. Because that's the point! You have complete freedom with Bitcoin, and you don't need to care what people think!
That's what make bitcoin better than other currency due to its decentralized nature.
The government has nothing to do to have a full control of bitcoin in many transactions that its people are making in the market and in many platforms.
We have financial freedom when we are spending our bitcoin into different uses that we want.
But still it is much better if governments will adopt bitcoin and they will regulate it properly to improve the economy of their country.