RT François
I've just learnt that Chrome on Android will not use the color defined in meta[name=theme-color] if it's too bright to ensure contrast with the UI.
See
https://source.chromium.org/chromium/chromium/src/+/main:ui/android/java/src/org/chromium/ui/util/ColorUtils.java;l=130

https://twitter.com/quicksave2k/status/1404754729134141440