As stated above, all the information is easily accessible on the FCC public databases. Removing it from this site won't fix anything.
Often first and last names along with pickup and drop off information is relayed using radio.
This is a training issue. The people using these radios are not "radio people", so they have no clue. I'm willing to bet my next paycheck that 99.999% of them could not explain the difference between the two way radio in the bus and a CB radio, cell phone, or even a wired telephone. All they know is you pick up this thing attached to the squiggly cord and push the button on the side. Through a mix of voodoo, 5G cancer causing radiation and evil lizard people, the noise comes out the far end and Bubba back at the bus barn answers you.
Schools have been doing the exact same thing with FRS radios for years. They pass student names, health issues, and all kinds of information that should not be shared with the general public over FRS channels. Through a lack of knowledge and
assumptions they think that it's 100% private and no one can hear them.
Radio users at schools need more than 35 seconds of training on how to use the radio.
Anything where personal info like that sent via radio needs to either be stopped, encrypted (yeah, go ahead, flame the hell out of me…), or the schools need to switch to LTE based communications.