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I am also one of those people who do not believe that your story is true.
From my point of view, the story you tell looks like it's just a fabrication to make the reader's interest as if it were real.
Children are innocent in the sense that they easily accept any information. If today he is taught about the Bitcoin logo, then they will try to depict the Bitcoin logo for a few days. When they get another, more interesting image, they will forget about the Bitcoin logo and will try to depict the newly received image.
Maybe OP is unmarried and has children. indeed, kids are naive, and they won't care what it is, so it doesn't make any sense for them to draw the bitcoin logo. My kid also saw the bitcoin icon on my phone, he was so excited when he saw it for the first time. but as soon as you give him something newer and more colorful, he will immediately forget what was before. just because kids draw bitcoin and play with bitcoin models doesn't mean they will be interested in it.