The AI-generated summaries posted on Airfield Directory are legally completely fine for several reasons: they do not consist of copied texts but only of facts expressed in new wording:

• Facts such as fees, PPR rules, phone numbers, or typical wind conditions are not protected by copyright and may be freely shared.
• The texts are not taken 1:1 from databases but are automatically reformulated. This means they do not infringe copyright protection.
• The AI-generated texts themselves are freely usable, including commercially, according to the AI-provider.

Apart from that:

• The copyright of a PIREP always lies with the author, i.e. the person who wrote the text, and not with the forum in which it was published. The forum or its operator has at most the usage rights defined in its terms and conditions (e.g. for displaying or archiving posts) – if such rules exist at all. It does not thereby become the copyright holder. Copyright remains with the writer, not the forum – and a fact-based summary does not violate this right. If, nevertheless, an individual airfield operator or author (but not a forum operator) feels their copyright or other rights have been infringed, the procedure for notice & takedown is set out in the Terms of Service, section 14.
• I would like to remind everybody that under Article 20 of the GDPR, every author also has a right to ask the service operator to export their own data in a machine-readable format, which applies to forums as well.

Every forum by the way is free to attribute and import PIREPs from Airfield Directory.

The claim “The moment this project receives a credible legal threat it will have to pack up. Then everybody contributing will have wasted their time” is of course just Trump-style fear, uncertainty and doubt.

Because the posted PIREPs on Airfield Directory are Creative Commons and are regularly exported, they remain free forever, entirely independent of the continued existence of Airfield Directory. This seems, however, to be very difficult for some minds to grasp.