[stickfigure]

I'm pretty sympathetic to this! But for the most part you pretty much can? AFAICT Google Takeout lets you download pretty much everything.

The only big controversy I'm aware of is trying to download your social graph from Facebook. You can't even export your friends' email addresses! But... this was a big controversy a few years ago when Google was pissed that Facebook would import all your Gmail addresses but FB wouldn't let them be exported back out. It seems like the privacy advocates argued Facebook's side of this.

You can have data portability, or you can keep data private. Without crazy DRM schemes, you can't have both.