That’s just plain dumb. If the NFL launched and investigation everytime a team made a compliant against another team it would be the National Complaint League. GMAFB.
No, it’s not dumb. This wasn’t just a silly complaint that was made by the Colts after the fact, involving a rant about some kind of judgment call by the officials. There’s a specific NFL office (NFL Game Day Operations) that deals with on-field matters like this where the issue involves a potential serious breach of the rules by one team. This office of the NFL has event-day staff on the field at every game specifically to deal with a situation like this one. They serve as the equivalent of a “grand jury” of sorts, referring matters to the league offices that require further investigation.