which was what?

If you rat out the government doing unconstitutional things, you lose your citizenship.

Did Snowden lose his citizenship? No. The US cannot revoke his citizenship per its laws. He fled to Russia and took an oath of citizenship there in 2022. But he didn’t renounce his US citizenship either.

What the above user is thinking of is how Snowden's passport validity was reportedly revoked in 2013, right after he had landed in Moscow.

Yea that might be it. But that doesn't strike me as unusual either. There are many situations where a criminal charged with a lot less has to surrender documents as a condition of being allowed out on bail while they await trial, if they're considered a flight risk. In Snowden's case, he knew he was going to face a lengthy criminal process and would be detained, so he (perhaps correctly) chose to leave before he made his revelations and before his movement was restricted.

Say someone says drink the cup of wiper fluid or I will shoot you, so you drink the wiper fluid. In a literal sense, you chose to drink the wiper fluid. I think most people would understand that you were forced to drink the wiper fluid.