@aral An older UK person I am close to needs to use a heart monitor. The doctors advised us that the best-available tech is the Apple watch and the ecosystem associated with it.
The alternative, non-BigTech solution was obviously inferior and had a horrible UX that even relatively tech-savvy seniors were clearly going to struggle with.
"Give up your data to BigTech or have worsened healthcare outcomes" is already here - even on what's left of the NHS.