I'm gonna bet $100 that this didn't really happen.
It is possible that this story is fictional. If the author confirmed the said photo of the
BTC-logo on the sand, drawn by children, then there would be no doubts. @Fuso.hp said that there was no mobile connection in that place, but he had a phone with him, if he could determine this. If I was in that place at that moment and wanted to tell this story, I would definitely take a photo to support what was said with evidence.
Even if this story is true, drawing the
BTC-logo by children means nothing. They can switch to other games the very next day and doesn't mean that they will become bitcoin-enthusiasts when they grow up. As children, many played pilots or sea captains. How many of you have become them now?
Well even if there is a photo we couldn't know if the story is true or not, OP could easily draw the logo in the sand and take a pic for a fake proof so it is really hard to determine.
But I agree that if this is true then for those kids it's just an art or drawing and they just like the logo so much.