The reason is that the browser maker is interested to support tracking.
On the technical level there is no problem to block tracking - intriduce noise and make APIs unavailable until user permits to a web site. But that is not implemented.
The same with native applications. If your bank app requires you to share your location you can't spoof it. The makers of Android and iOS made spoofing of geo location impossible - you don't have that control, which means the phone is not your device. You have to give up your real location.
On the technical level there is no problem to block tracking - intriduce noise and make APIs unavailable until user permits to a web site. But that is not implemented.
The same with native applications. If your bank app requires you to share your location you can't spoof it. The makers of Android and iOS made spoofing of geo location impossible - you don't have that control, which means the phone is not your device. You have to give up your real location.