Social media is not private, emails are not private, internet searches are not private, your text messages are not private.
“I use a VPN!” Your ISP can see when you initially connect to a VPN. The VPN company will comply with a subpoena.
“My socials don’t have my real name!” What about the email to register that social? What about your wifi provider? They provide the IP address from which you’re frequently logging in. Don’t they have your information?
Your cell carrier will comply with a subpoena.
You ISP will comply with a subpoena.
So will Google, Apple, Yahoo, Meta, Tumblr, Twitter, you name it. None of them will fight the government on behalf of a random person they don’t care about.
This is why fighting for online privacy laws, real actual privacy laws, is so important. It’s why using services with end-to-end encryption is so important. It’s why if you don’t want any chance of law enforcement to know about something, you cannot post about it online in any way.
The messages we recieved growing up about being very careful about what you post online wasn’t fear mongering. They just picked a different villain.