Yes, but countries like Russia and Pakistan can hardly be called liberal democracies. If there is no free speech, then it is difficult for citizens of those countries to take action. That is where corporations challenging the government can be helpful.

I don't see why we shouldn't expect corporations to take on the role of challenging the government. It is in Twitter's interest for governments not to crack down on free speech. So when governments do crack down, it is in their interest to stand up to those governments, especially when they don't have any employees or assets in those countries.

One worry would be that the Russian government could threaten Twitter with cyberattacks.