I upgraded to windows 11 by accidentally pressing spacebar on startup
(piefedimages.s3.eu-central-003.backblazeb2.com)
My 10 LTSC runs out in 2027 without extended support. It's been my main driver for years.
I also don't have this issue of accidentally upgrading. Though if it did I wouldn't notice because I always hibernate to avoid waiting an hour for startup.