"Readers may recall that Japan recently passed the Smartphone Act, officially the Bill on the Promotion of Competition for Specified Software Used in Smartphones. Among its most important reforms is a direct prohibition on Apple’s long-standing ban on third-party browser engines on iOS.
This ban has functioned as an effective ban on browsers like Firefox, Chrome, Edge, Opera, Brave & Vivaldi, by forcing them to use Apple’s WebKit engine, which they cannot modify or control. This results in no effective browser competition on iOS, and web apps being deprived of the APIs and performance they need to compete with native apps."
https://open-web-advocacy.org/blog/japan-apple-must-lift-engine-ban-by-december/