Not your key, not your crypto. => Not your key, not your data.

Why would anyone want to encrypt their data and then hand their private key to anyone is mind boggling.

Well they are not told. Our culture and Steve Jobs cult were magic-ifying computers as way to sell trivialized, unethical and anti-intellectual software (compared to earlier home computers). Software nowadays aim to give barebones information, doesn't encourage for making educated decisions while extracting as much as possible from users.

Microsoft was once made "intermediate" or "power user" possible. I know many tech literate GenXs and millenials who were able to learn to do relatively complicated things with computers, even when they could outsource the job to others. Now Microsoft is in the same bandwagon to shove crappy undone and idiotic software riddled with ads. It generates better revenue than designing better interfaces that educate the users while not looking down upon them.