They can't: https://developer.apple.com/support/alternative-browser-engines/ https://developer.apple.com/support/alternative-browser-engi... (except through t

They can't: https://developer.apple.com/support/alternative-browser-engines/ https://developer.apple.com/support/alternative-browser-engi... (except through the, purposefully onerous, EU alternative regulations. Which apple charges apps a per-install fee for. Normal apps can only use Webkit, without any plugins or changes)