I can't seem to find any forum dedicated to EU261 (Regulation (EC) No 261/2004 of the European Parliament and of the Council of 11 February 2004 establishing common rules on compensation and assistance to passengers in the event of denied boarding and of cancellation or long delay of flights, a.k.a. EC261), just ad hoc posts in loyalty-programme-specific forums. Am I missing something, and if not might a dedicated forum be a good idea for generic questions about applicability of EU261 to all the interesting non-airline-specific corner cases?

I suppose it should also cover UK261 (the Air Passenger Rights and Air Travel Organisers' Licensing (Amendment) (EU Exit) Regulations 2019), since currently the net effect is that the rules (and existing case law) are closely aligned to EU261 (though in the future the case law might conceivably diverge). So maybe the forum should be "EU261/EC261/UK261"!