They pop up from time to time and 'plop', don't they? Like seagulls, as has been pointed out!
But I think they are at bay just now for the simple reason that, try as you might, it's becoming harder and harder to defend H & M, or to find anything positive to say about them. Even their crazy fans have got a job on their hands to present H & M's recent behaviour in a positive light. I look at Celebitchy (purely for research reasons, you understand...) occasionally and it's fascinating to see how they are twisting both the facts and themselves into knots to try and spin things positively.
Going back to the silly 'positive threads' about Meghan's clothes, I think that is becoming the only area they feel relatively safe in - and even then, they have to demand that no-one says anything critical. It's utterly pathetic and embarrassing but they have clearly pinned part of their personal identity to their adoration of Meghan and Harry, and they must find their decline traumatic.
It's a cult, as someone on here rightly pointed out!