It could happen to you, but it has happened, is happening, and will continue to happen to other people. And you enable it happening to other people by participating in it.

Here's a good example

Here's another where the police used Facebook messages to target a woman getting an abortion

Just take one look at China to see the kind of dystopian future we're heading toward. Look up Zhima credit. Look up what happens to protestors.

The short version is, your government can easily turn fascist at a moment's notice, and when it does there's no way to claw back all that data you put out there.

I don't give a single shit about what Google or Facebook has on me, other than the fact that they give a backdoor to that data to every government body that asks.