Most of the C&D cases I've heard about on HN, have been against small open source projects that absolutely don't have the legal resources to fight it, and I'm sure the ones sending that letter know it. I suspect that companies are much more likely to send a C&D to an individual or small community than to a company with a legal team.

> And if this C&D is caved to, then so will future ones, and Nitter won't have any use anyhow.

I don't agree with any of that but ok. It's not like they can stop instances in other countries they have no jurisdiction over, so I don't think its "use" will suddenly vanish.