What would people do if the web backend that safari and third party browsers are obligated to use refused to let you access a particular site?
Its trivial to censor if you don't have a right to install the software you prefer.
Its trivial to censor if you don't have a right to install the software you prefer.
Hard to control billions of users that own machines easy to strong arm a few vendors that don't want to be excluded from lucrative markets.