Now for a silly, self indulgent post
Since S1 of Miraculous Ladybug, people in the fandom have been wondering about the Agrestes. Not just all the obvious things to worry about, but like-
In S1, Simon Says ep, we got a look at the Agreste mansion security, and it was... Strange. Sure, Gabriel Agreste is a paranoid man, and (S1 voice) if he's Hawkmoth then it makes a little more sense. But. Adrien hasn't been allowed to go to school, ever, and the reason Gabriel gave in Origins about why not? Security. Years and years of not Hawkmoth, but he's (S1 voice) (and also his mom maybe) still worried about it. So what got him/them so paranoid?
S2 made this worse. Yes, he's Hawkmoth, he has an evil lair that he access through a Tube, and he's got freaking missiles in the lair. This isn't even getting into his Basement. We also saw he had the Peacock miraculous. A lot of people who figured out Gabriel and Emilie had been using the Miraculous before, and wondered for what purpose (Senti Adrien theories wouldn't come until one of the last S3 episodes, Ladybug). And it was this big idea, back then, that they were threatened by... Something. Some manner of enemies, that could hurt them, and that they had been so careful with their son because they were scared of them.
Now, eventually, the fandom moved on from those theories, and eventually forgot them.
Since 2015 I have had the deep, unwavering belief that there was a much bigger threat than Gabriel. That something terrible was going to come for our protagonists if Gabriel was ever defeated, or even if he won. That Hawkmoth existing put a limit to this secret evil, but if he was gone, or stopped being evil, then They (whoever this mysterious threat was) would come for our heroes.