Apple is on the W3C board that gets to decide which APIs become standards. They are preventing these APIs from becoming standards. They have an interest to forbid Web Bluetooth and NFC from becoming standards, because they profit heavily from native apps on their iOS platform, where they collect a percentage of all sales made through apps, so they want to force developers to create native apps instead of web apps.
I'll also point out that Opera, Edge, Samsung and others did implement the Web Bluetooth API, so you are wrong about your assertion that they "couldn't convince any other rendering engine to implement them".
https://caniuse.com/web-bluetooth
If you don't think Apple is abusing their power here, then you are either lacking understanding of how Apple operates, or you just love Apple a little too much.