First of all Twitter is not a "vastly richer internet giant". Secondly, the whole point of regulation is that twitter has to comply. What you pointed out they can ALSO do is sensor all the other tweets as a form of a boycott.
What the article points out is that for people opposed to sensorship, it's more productive to stop governments from sensoring, rather than pressure Twitter. If Twitter goes away, there is no guarantee other companies won't sensor things as well.
What the article points out is that for people opposed to sensorship, it's more productive to stop governments from sensoring, rather than pressure Twitter. If Twitter goes away, there is no guarantee other companies won't sensor things as well.