Not surprisingly, class actions have been discussed on this forum before - general feeling is Portugal doesn’t have such a thing for “personal” issues.
PT law also doesn’t seem to care much about jurisprudence either. So two GV applicants can file similar lawsuits against AIMA to move their applications along, making similar arguments… but in the end it’s just a scandalous lotto of whether you get a friendly or unfriendly judge. Plenty of examples in this thread:
https://community.nomadgate.com/t/is-it-lawsuit-time-processing-times