Same! Mark Rober is what changed my mind about YouTube for kids. He's a wildly popular creator that's even shilling a product and yet... I'm ok with all of it? He seems to very legitimately care about sharing getting kids excited about STEM, and if he gets rich doing it: great! The product is less offensive than the sugary cereal I watched commercials for while watching Saturday morning cartoons as a kid. Definitely one of the few YouTube channels I let my kids watch unattended.
There's shilling a product because someone handed you a bag, and then there's building a product you believe in. You feel okay with it because it's clearly the latter versus another NordVPN commercial. Even if the product ends up failing (and I am under no predilection to believe this will) he has presented nothing but honest enthusiasm towards his goal that you can't help but root for it.