ASiegel wrote:
@IKE

Also, KaiOS does include an official Youtube "app" (fullscreen website) by default but not all KaiOS devices support over-the-air software updates.

It is rather likely that there is a legal agreement between the KaiOS owners and Google that grants KaiOS the right to use YouTube branding but also ensures Google do not break YouTube compatibility with KaiOS devices for a certain time period.

The same applies to Facebook, which is included as a standard "app" (fullscreen website) on KaiOS phones as well.