So you would also ban RT, Al Jazeera, and what else? News service of every government you don't like?
And when Trump does not like Germany anymore, would you also ban all German news services?
No. It's a false equivalency you're making.
But if Facebook was owned and controlled by Vladimir Putin, I don't think it would be wise for the rest of the world to be on the platform either. Difference between a news outlet and a social platform that acts as a lens through which people see the online world (and increasingly, the online world matters more to people's thoughts than the offline).
If Google was a Chinese company, I'd trust the search results a lot less than I do now, especially on anything having to do with Chinese news, history, democracy, communism, etc.
I don't think US corporations or scientists should conduct communications on Wechat either.