That is not really matter whether you use 10 bitcoin or 10 bitcoins. currency terms are not created equal. there are communities who do not use plural forms for money terms.

for each thing which we when call in multiple then we call its plural name, so in bitcoin case we have use the same gramatical rule also, and we have to call 1 BTC as 1 bitcoin and have to call 10 BTC as 10 bitcoins.

Indeed there are no differences and because of this it really does not matter, honestly I do not think this a topic that really matters..

It doesn't really matter, but like any other currencies like dollar becomes dollars and euro to euros I think bitcoin to bitcoins seems correct.

Knowing the right term does matter.  If you are in a middle of presentation and just throwing words without knowing it's proper term, then your audience won't see you as profesional and knowledgable about stuff you are talking about.  How can you respect an advance idea when you see the presenter can't even define a simple singular term from plural term.  Anyway, I might be not best with grammar but it should be 10 Bitcoins

Basically BTC = bitcoin or bitcoins, it doesn't matter any way how you read, but according to english subject, because its a subject in our country and the same time english is our second language, and its 10 bitcoins or 1 bitcoin.

Weird question bruh, but for me, i use 10 bitcoins, let's give an a example. Let say 100k satoshis, you don't say 100k satoshi because it's inappropriate. 10 bitcoins is the correct term.

I would write 10 bitcoins without any hesitation. Just like 10 Swiss francs or 10 Mexican pesos. The example of the US dollar is a twisted one. We should not follow it.

Both are used but I think the correct term would be 10 bitcoin.
The same applies for the dollar/euro
You owe me 100 euro, or you owe me 1000 dollar