Why for Google Chrome push-enabled rate is very low, but for Safari it is about 99%?
For Chrome, this number reflects all unique users who have visited your site and pressed "allow/block" notifications or closed the prompt window. I.e. those who have interacted with the pop-up.
Total devices for Safari is the number of push enabled and push disabled devices only. I.e. those who have pressed "allow" button and those who have manually unsubscribed from pushes.
That is why on Safari push enabled rate is higher.