This seems silly. Lots of kids never learned about computers even when they were available. A chromebook was just an electronic school aid. If the interest was in computers they would learn about computers.
I think this is a fairly dumb take. In the schools that I saw that had chromebooks a kid might be taking English, Math, AND computing. It really was up to the school (and parents) to introduce computing, not the machine that was the general replacement for books.
Anecdotally: a high school near us requires every student to have a computer. They do not hand out chromebooks and the requirement specs are a higher end Mac or PC laptop that the kids are required to bring to classes. These kids use blender, maya 3d, office suite, video and music editing software for example. They absolutely do not know any more about computers then chromebook kids (with a few exceptions). Having access to a computer doesnt magically make them know about how computers work.
Did you get everyone to settle on the same thing, like Signal? We are spread out over about 8 countries, and with all the different phone numbers and plans, we use various methods, with several of us on Signal. Some on whatsapp, some on messenger. So we are not coordinated enough for a group chat. Which is fine, I dont really need to know everything all the time, we catch up when can, or get into small video chats occasionally. Luckily we do tend to physically see each other somewhat frequently.