In my case at least, it's because Python has a strong ecosystem. Everybody's heard of it - parents, kids, and teachers. There are lots of good kid-friendly education materials.

Of course, that begs the question "how did that ecosystem develop in the first place?", but I can't answer that.

It's so easy to get started and it goes a long way. From "input your name" over servers to machine learning.

It's a very clean language.

It doesn't require a person to change how they think about programming from their college C or Java classes, but is a lot simpler than those two languages.