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Apple created HIEC for themselves. They use it within their own gargantuan ecosystem to their own, personal benefit and to the benefit of people all-in on Apple devices. When it's time to send it outside, they automatically gets converted to JPEG/MOV files.
They do not care if you like it or if you even use it.
they automatically gets converted to JPEG/MOV files
nope
They do, most of the time. For example if you upload an heic file from an iPhone to a file input on a website that doesn't accept heic files, it'll upload a jpeg.
Apple can't see or control all the different ways of transferring files, though, so in practice it still causes problems sometimes.
The strange thing is that some Android phones also save photos as heic files and make no attempt to convert them, so I still had to add logic to my websites to convert them myself.
Heif is covered by patents in the mpegla patent pool of which apple is a member. They have a vested interest in it becoming mainstream.