I'm not sure if Canon has ever been very hawkish about this, but it's interesting to hear it reaffirmed that an electronics warranty cannot be voided just because you did something like open up a device on your own.
https://arstechnica.com/tech-policy/2018/04/ftc-warranty-voiding-language-like-nintendos-and-sonys-is-illegal/
https://www.ftc.gov/news-events/press-releases/2018/04/ftc-staff-warns-companies-it-illegal-condition-warranty-coverage
https://arstechnica.com/tech-policy/2018/04/ftc-warranty-voiding-language-like-nintendos-and-sonys-is-illegal/
https://www.ftc.gov/news-events/press-releases/2018/04/ftc-staff-warns-companies-it-illegal-condition-warranty-coverage