So many kids toys use custom brick chargers, especially remote control cars. I refuse to buy anything that isn't USB-C, I'm not keeping track of all of those.

With a soldering iron and USB-CD PD trigger boards, I've successfully converted a few of this kind of thing.

The step I've taken is just purchasing USB-C to barrel in various voltages and labeling them appropriately.

I think that's changing too, my son got some cheap radio controlled boat a few weeks ago, the remote uses AA and the boat has USB-C as input (interestingly enough, it has a weird USB-C cable with a built in light to signal when charging is done).

I recently bought a very cheap RC car for my kids, and it was USB-C rechargeable but instead of having a port it just has a USB-C cable that comes out of it and plugs into a power brick. I love that.