These are both true statements, but there's a huge difference in scale.

The UK arrests 12,000 people per year for social media posts ( https://freedomhouse.org/country/united-kingdom/freedom-net/... ), for a broad range of vague reasons including causing offense. That's far more than much larger totalitarian nations like Russia and China.

The US arrests folks for direct online threats of violence - a much higher bar.

Not anymore. Now in the US you can be arrested if cops think you disrespected a dead guy they liked[1]

[1] https://apnews.com/article/charlie-kirk-meme-tennessee-arres...