salutation in a letter or email. We arent talking about just your average internet commentators; you will see this disparity even in professional writers. How to write good morning (or good afternoon) in an email depends on how you are using the phrase. Everyone likes a friendly greeting. It is just more convenient to write it without having to capitalize the first letter. Names of regions, states, districts, names of cities, towns, villages, names of rivers, oceans, seas, lakes.
You can write Bitcoin or bitcoin and no one is going to call you out. English grammar, nouns, capital letters are used with particular types of nouns, in certain positions in sentences, and with some adjectives.
'you are in a world of trouble' or 'a fantasy world is a nice place to visit'. If you do it in writing, such as an email, capitalize it if it is a greeting. Which one is correct? Right now none of these are the correct or incorrect usage. The Hobbit.R.R. On the other hand, if you are using good morning as a closing of your letter (though that would be decidedly old-fashioned it would not be capitalized. You can say that this house is worth a thousand bitcoins and that will be perfectly fine. Why then do we insist on writing bitcoin the way we do? When referring to the Earth, yes. Now, this question raises another question. As you can see, the logo most commonly associated with bitcoin spells it without capitalizing the. In the dialog, the whole phrase is capitalized, but thats rare to see.