All of these could be considered an "author's purpose". An author is technically anyone who writes anything, therefore the purpose of writing is theoretically limitless. If you have to choose one of these, however, it would be "to remind".
Well what I honestly think is : They don't know how it will end up . This is an confusing quote honestly
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What you can ask your self:
Do you know how far you can go as you want?
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But this is an incoherent question!
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As you know this first came from a video game! But you know social media, it got really popular! Then you started to see it all over.
Examples:
Memes
Youtube
Even on Shirts!