Why is everyone using the word One in their products now?

HTC names their phone series One
Microsoft names next-gen xbox the Xbox One
now Youtube has this Youtube One thing, god knows what that is and is it even affiliated with Xbox One.

It's so unoriginal, like the cycle with samsung's phone branding - Galaxy S
then everyone started to use it
Apple iPhone 4S
Sony Xperia S
HTC One S

You are a one

Maybe because its catchy?

I see your point. But granted, the iPhone 3GS was out before the Galaxy S

It's what company's think are "funky" "cool" and "modern". They all compete with one another so whichever one these companies think will be successful they tend to copy or imitate. What they think will be the next big thing essentially.

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