"Technically this forum is an entity of AIRC and runs out of Austria, so any legal issues would be have to be dealt with there. At least until Asgardia is recognized as an independent nation" - Jason Rainbow
Actually, that's not true. Under United States Federal Law, any threats from any location which are affecting a United States Citizen constitute commerce in the location of the victim, through International Commerce, making the matter a Federal felony (18 USC 2261A). Alternatively, in Australia and other countries (UK) anyone who is defamed may seek legal action in the court where they feel they can obtain the most damages by action and the media is visible, making several high profile libel suits filed by persons who are not even Citizens of Australia for impact to their "right to publicity" or "commercial value" of their public image in the Australian court, fairly successfully I might add. It is also a crime, not a civil matter, meaning the publisher of the threats may be subject to jail time in addition to fines (monies to be paid regardless of costs or damages).
Cooperation of the UK, US, and Australia have led to several cases of monetary awards despite no incarceration to date. In Mexico, if you criticize certain people, they find you on a bridge the next day (bloggers), but I would not call that entirely legal; however under Texas law an attack on a person's reputation is the same as an attack on their body or family (where such claims are not true), and self defense covers the entire scope with deadly force (it's Texas, don't blame or judge me, not a fan).
So the server being in Austria only means that an order to make changes on the server would be required from an Austrian judge, or similar International body or country with treaty to enforce (which Austria has) a foreign order (like a search and seizure, subpoena, etc). For data gathering, these requests are fulfilled almost automatically (domesticated) in cases of International law, sovereignty, or commerce activity affecting the citizens of a foreign nation - and since the NGO is based in Germany, I know their courts will process such orders immediately for identifying information on probable cause. I've worked with a GmbH for years, and we deal with this issue daily in crypto-voice communications services for that company and its global user base. Germany wins only when such information is not retained, and ISPs in most countries are required to retain such records (access logs, IPs, user details) for such reports.
The main question is, is the server host country a signatory of the Berne Convention (International Copyright and Trademark Treaty) or not? Because most disputes arise from the core issue of threats or misuse of a "registered Citizen" name or other identifying photo or details associated, which the nations have power over (ownership) in International Commerce under Treaty.
There is no "Internet Law" - only treaties among nations and the Berne Convention governing publicity of registered identities (reputation in Corporate commerce under the Articles of Rome).