Were these implementations already easily open source accessible at the time, with tens of thousands of people already actively using them on their computers? No, right? Doesn't seem feasible this time around.
I don’t think an import ban would be any harder to enforce than an export ban. In fact if anything, I’d expect an import ban to be easier.
Though I’m not suggesting an import ban on DeepSeek would be effective either. Just that the US does have precedence pulling these kinds of stunts.
You can also look at the 90s subculture for passing DeCSS code (a tool for breaking DVD encryption) to see another example of how people wilfully skirted these kinds of stupid legal limitations.
So if you were to ask me if a ban on DeepSeek would work, the answer is clearly “no”. But that doesn’t mean it’s not going to happen. And if it does, the only people hurt are legitimate US businesses who might get a benefit from DeepSeek but have to follow the law. Those of us outside of America will be completely unaffected. Just like we were when US tried to limit the distribution of GPG.