Rainbows were commonplace on everything related to kids; always on their toys, one of the first things they learn to draw to help understand the colour spectrum. They've been strongly featured in both children's films and books, as well as usually found on some charities' logos.
The hijacking of the rainbow on behalf of the progressives has probably been done subliminally to psyop kids towards it.
Biblically, God made rainbows after the great flood as a sign of his covenant with Noah that he shall never again flood the world to cleanse it of human corruption as he had done.
Yes, I've been beating this drum for a while. It is the perversion of Christian symbolism.
Growing up, I had this rainbow decoration on my wall. I really liked it. One of my older sisters took it when my mom died, and then returned it to me a few months later. She quipped "I guess it can be a pride rainbow" (don't know why she said that... I'm not gay). I immediately retorted "This isn't a gay pride rainbow, this symbolizes the covenant made between God and Noah that He would not flood the Earth again."
Another perverted Christian symbol is the morning star, or pentagram, now widely associated with witchcraft, satanism, etc. I had a college roommate who was afraid of even discussing that symbol because he thought it was pure evil, until I explained to him that it adorned one of his religious buildings.
This is why I bought a rainbow maga hat.