I would sometimes worry about that. At some point internet privacy will be completely erased, not by malicious or greedy corporate practices but by algorithms scraping all of big data on the internet. This will ultimately be inevitable, almost everything you've ever posted on the internet will at some point be retroactively traced back to you.

The upside is that this isn't what's going to happen to your data, nor to my data. This is what's going to happen to _everyone's_ data. As long as the whole world bites the dust together, I can see the actual damage being minimized.

Of course, this does not take into account living within governments that don't care about human rights and that you happen to disagree with or be critical of.

50 years from now the technology should have improved so much that Google will look laughably blind and powerless, I'm afraid. Let's not forget that Google, for all its evil, is still just an aging part of the dying old internet, that was naively brought into existence to be interesting and useful at a time when the world was not expecting that such a thing was possible. Now the technology is slowly aligning with expectations and will soon assist on surveillance and control. We will miss targeted ads.