"Your account" vs "My account" - wording

Just curious to ask.
Why O'reilly put the word "Your account" words on the right top portion, instead of "My account" or other, for member log-in purpose?
As a user point of view, I am logging into my account, not I am logging into "Your account". In term of UX design, would it be weird for the words of "Your account"?
Maybe there is the reason behind. Hope you could share...
I am just curious.
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