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.
You see crypto currency is totally banned in the country where I live. And the parents whose pictures I'll share on the Bitcoin forum who are involved in Bitcoin will not take it well if they suddenly see their son's picture on this forum. And I also don't want to bring their son's picture in front of everyone. And this is not a fictional story but my real experience and that real experience is what I have shared here.
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?
But I never once said that they would gain a lot of experience about Bitcoin by seeing them draw the Bitcoin logo. The only reason I am sharing this incident with you is that I love such children's activities.
I'm gonna bet $100 that this didn't really happen.
There is nothing to prove here. I have not shared the pictures just to protect privacy. It is entirely up to you to believe or not.