Think about how, right now, people willingly take selfies and upload them on various social media platforms. They also use filters and upload videos too, all of this is essentially giving the government free data to train facial recognition software. This doesn't seem like a big deal, especially to the younger generation, but it will end up biting many people in the ass 20 years down the road. Why? Well:
1. Facial recognition software has gotten scarily good, and will continue to get better in 20 years. If you upload embarrassing nude photos of yourself right now, in 10-20 years someone could take a recent photo of you and end up discovering your nudes when the software matches your recent photo to your younger nudes. And don't think that the software won't be able to find you because you were younger or had a different hairstyle or makeup. As I said, it's gotten very good. Age progression software has also improved and will also continue to get better, so combine that with facial recognition software means that your photos can and will be found no matter what you looked like when you took those embarrassing photos. The only thing that seems to fuck up this technology is using low quality photographs. Which brings us to the next problem...
2. Shitty phone cameras won't exist anymore. Even if you buy the cheapest phone, it will have a camera that takes high quality photographs so facial recognition software will always have enough data to find you. I have read some articles where people suggest wearing masks or certain makeup patterns that mess with the software, but again, in 20 years those tricks won't work. If it can't find you by facial features, it will find you by other features, like posture, gait, moles/birthmarks, tattoos, how you smile, locations in the background, etc. I suppose people who care about privacy could start taking Polaroid photos or just never take photos ever again, but even then, there's another problem....
3. Cameras and video surveillance are becoming cheaper and higher quality. Right now it's hard to find a place that doesn't have stop light cameras, and businesses are using higher quality cameras as well. Right now you can hop on amazon and get security video cameras for your home for a couple hundred bucks. Oh yeah, what about those doorbell cameras? Amazon is pushing their Ring camera hard and it's cheap too. The cameras are getting better, smaller, and cheaper. Now imagine how it will be in 20 years? It won't matter if you never upload photos of yourself, cameras will be everywhere. Good luck trying to go anywhere without being on camera.
4. Another fun problem we're going to be dealing with is Deep Fakes. Think of the ramifications of this. Eventually, there is going to be some video of some politician doing something they shouldn't. But, later we will learn that the video isn't real. It will be a deep fake. Once the first high profile politician does this, it will open the door to where no one will ever be able to trust video evidence. Any time someone sees a video of their politician smoking crack or banging a hooker, all that person has to do is claim that it's a deep fake video. Even if someone can prove that it's a real video, it won't matter, there will be enough doubt that lots of people will think it's fake. Deep fakes will be used to destroy reputations of people the government hates, and they will be used as a scapegoat when powerful people are caught breaking the law.
5. Good luck trying to discover the truth about anything in 20 years. In addition to never being able to trust pictures, audio, and video evidence, you won't even be able to trust the people you are talking to. Bots will become good enough that you could think you're arguing with a person but in fact you are arguing with bots. Example, let's say you come on KiwiFarms to argue about a video of Selena Gomez snorting cocaine. You come on here with your autism, ready to explain why that video is real and not a deep fake as Selena's PR team claimed. However, there are lots of kiwis that argue it's totally fake. You waste time trying to argue why it's real, but it's no use, 20 kiwis are telling you it's fake and now you're having some doubts. Eventually you give up and accept maybe it is a deep fake. Little did you know, most of those kiwis were just bots. Political campaigns already use bots on reddit to argue and spam campaign approved talking points, so just imagine how bad it will be in 20 years.
TL;DR: Big Brother and bots will rule the world.