Unless you've been living under a rock for the past few years, there've been multiple reported rapid declines across multiple species, not just "this species that for some reason stands out". Some species are naturally more studied than others (because of availability, accessibility, observability etc.), and when they collapse, it's can be immediately observed.
Because it's a symptom of a much larger problem. Namely, collapse of insects in general: https://www.theguardian.com/environment/2019/jan/15/insect-c...
Unless you've been living under a rock for the past few years, there've been multiple reported rapid declines across multiple species, not just "this species that for some reason stands out". Some species are naturally more studied than others (because of availability, accessibility, observability etc.), and when they collapse, it's can be immediately observed.