BitCoin is NOT a currency. Any business is rolling the dice accepting BitCoin with how volatile the price is. With how rapid the price swings (mostly down), no logical business would/should accept BitCoin. No different than gambling. To my knowledge my dollar last week is still a dollar today, not true with BitCoin, you would have taken a hefty loss this week only!
Here's the Webster's dictionary definition:
1.
a : circulation as a medium of exchange
b : general use, acceptance, or prevalence
Let me also give a list of stuff that was once used as currency (sometimes they still are used in parts of the world)
1. Gold
2. Furrs
3. Tobacco
4. Salt
5. Gemstones.
Have the value of these items stayed the same? No! Are these backed by a country or a central bank? No! Why are you even on this forum? GTFO! And look at your username! Do you even know how bitcoin even works on a basic level?