In some countries bitcoin cannot be use to buy Real stuffs like food clothes and other goods and services but even though bitcoin can be used in plenty of ways mostly in the cyberworld it is used in online markets like Game Credits, Gadgets some use it in the dark webs to purchase weeds,drugs. Others are trading it to a different crypto-currency or exchanging to dollars, so how to you use it ? 
Yes you are right that we cant directly spent bitcoin to whatever goods that we want however we could now easily converts btc to fiat and it that way we could still do the spending. On the other hand since we cant use it directly it would just serve as for money making or saving more than spending