Teaching kids how to use computers with programs and operating systems they will never come across again in their whole life. That is a really good idea.
For that matter, mixing windows and Linux might be even better since they’ll need to adapt and transfer knowledge (although this would probably be painful and exhausting for everyone involved)
EDIT: also how do you not think that Ubuntu using kids won't go on to use this free tooling in the future? MS spends a ton to target the education market because they know that you can get kids hooked early you get easier wins.
This may be an essential skill to have in this era of automation with LLMs. People who have never programmed before are writing cli scripts to save time and enhance their work.
Ubuntu is easier for beginners to program with, and Windows has WSL so the skills can transfer over.