Questione giuridica chiave
Whether the appeal against the interim decision on party status was admissible under Art. 93 BGG.
Decisione estratta
The appeal was inadmissible because Swisslos did not show a non-remediable legal disadvantage; any burden was only factual.
Motivazione estratta
A mere increase in procedural burden, access concerns, or possible influence on the proceedings does not constitute irreparable legal harm; any eventual prejudice could be cured by a later appeal against the final judgment.