As an American I grew up seeing Robert Goddard and his famous first liquid fuel rocket everywhere in various books on the history of rocketry.
As I got older and read more I became more impressed with the fledgling rocket club (Verein für Raumschiffahrt) that Werner von Braun was famously a member of in post-WWI Germany. You couldn't help but see parallels to closed vs. open collaboration as Goddard, always secretive, seemed to get stuck on developing the necessary fuel pump while von Braun and collaborators were able to move forward to develop the high-speed, one-shot turbine that ultimately delivered the goods.
I am not sure if it was Willy Ley's classic ("Rockets, Missiles, and Space Travel") or maybe even Arthur C. Clarke's book ("The Promise of Space") where I got that sense. Both books are oldies but excellent.
The app is available as a standalone APK now: https://channelwhitelist-tilda-ws.translate.goog/?_x_tr_sl=a...
Unfortunately i could not find sources, but it works rather well and has English UI as well
Of course, parents have been asking for this instead of the shitty "YouTube kids" garbage for... ever? Basically? So clearly Google just doesn't want to do it, for whatever reason. Probably doesn't let them extract as much money from advertising to kids, somehow.
It seems it might be related to legislation surrounding account ownership by minors, but I have no idea how to confirm it, esp since it's supposed to work when a parent controls the account.