Over the next decade, downloading and storing and processing such dumps of leaked data will continue to become quicker, and require smaller devices.
Over the next decade, mobile devices will shrink, resulting in smart glasses much more powerful than today's smart phones.
Put that all together...
It's 2030 and you're walking down the street. You pass by a stranger wearing Apple Glasses.
The stranger once spent an hour installing an "Intel on Everybody!" app, and downloaded 100 TB of random leaked data from a torrent site on everyone in the world.
As you enter the stranger's view, the glasses use the leaked data to facially identify you.
Now that the glasses know who you are, they automatically alert the wearer of the types of data they know about you.
The bored stranger occupies himself by reading your gmails from 2022, perusing compromising photos you saved, checking out your medical records, reading arguments you had here in the comments of HN, etc etc.
Maybe my understanding of technology and security is wrong somehow, but that future seems awfully plausible to me.
If the downside to minimizing my footprint is that I use DDG instead of Google, the upside is worth it.