Some people are more effective at lawsuits than others, none of the failed ones really matter because it only emboldens him. Which is a false sense of security if he runs into someone actually competent. Serving is just ones step, a lot of times you have to prove damages too. And malicious intent on the others part which can be excused as ignorance in a lot of cases. Until it no longer is and once it's documented they know a thing they pushed was false they can no longer push that narrative without risk of further lawsuits that can stick.
Depends on many circumstances in the places each person is in that eventually come together. Lawsuits that are different states are already complicated and different countries makes it more complicated. People are better off proving null is evading taxes so they can send tax collectors after him, which may vary in results depending on what country he is in.
It's worth noting that Null has nearly lost lawsuits against people who are incompetent.
In regards to damages, a bunch of states have laws against doxing, but even if your state doesn't you might be able to sue for harassment. Proving Malicious intent should be pretty easy. You've already seen this thread, but for anyone wondering its a good place to start:
https://www.onionfarms.com/threads/null-openly-engaging-in-cow-tipping.4550/
Due to that, one might be able to get a gag order to shut the site down during the lawsuit and prevent null from streaming MATI, especially since Kiwifarms has doxed people and lawyers for just sending legal notices to the site. Anyone suing the site should do this as they will probably make a thread on the lawsuit and harass your lawyers.
It'd also be incredibly funny if Null was sent a gag order.
Because of how Null and his jannies act on the site,
section 230 will not protect them from liability. That article talks about various conditions in which section 230 does not apply, such as if the website is selectively promoting content. They are the ones who personally choose which lolcow threads to bring out of propspering grounds, which lolcows get their own special subforums, which posts get promoted on the frontpage, and which lolcow caricatures to feature in the background wallpaper of the site.
Section 230 also doesn't protect them if they are developing/inducing illegal acts. Null admits that he's allowed illegal and borderline illegal content on his site. Such as revenge porn, animal abuse, leaked nudes, stolen passwords, and stolen financial details. He has said he won't ban users who break the law, openly asked for nude leaks, made secret forums, and asked his users to cowtip.
This is also why kiwifarmer's comparisons to other social media are disingenuous, as sites like twitter do not do this.