Here is an example:
My best friend doesn't see the advantages of Bitcoin.
When we talk about the currency or mention numbers and quantitates of the asset, the word should be spelt with a lowercase b.
Here is an example:
I sent my best friend 1 bitcoin as a birthday gift.
Do you pay attention to this while you are posting on the forum?
I think this is about difference in semantics. The difference is not closely felt but with the example I see that the first is pointing to the name Bitcoin and the second is about the digital currency.
To the second example, it is particularly about the spendable coin, fractions , example 0.002btc
Semantics is indeed a good explanation because it talks about general concept of something. I don't really care in a sense that things are still the same. There are existing misconceptions already such as Bitcoin represents the whole cryptocurrency industry. That's how popularity works, but in this case it is a a difference between a concept and amount. I don't really get why a discussion still is needed in such topic lol.