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We can use bitcoin anytime and everywhere.
Is that so? I challenge you to go outside. Naked and only with some Bitcoin equipped and then try to buy some cloths and something to eat with Bitcoin. If you can do this, then i will believe you. I know that i would either die because of hunger/thirst or end up in a mental institution because i could not buy anything to wear.
Haha, that's a funny one.
Having said so, you probably can't buy clothes in New York with Singapore dollar, does that invalid SGD's worth?
Probably not, but nobody claims that you can use the Singapore Dollar "anytime and everywhere". But if someone would claim it and i would go and and try, just to find out that it is not true, then i would be pissed and stay away from Singapore Dollars in the future.