Huh, most anime cons have horrendous if any marketing. Beyond basic social feeds most of their reach these days are from inviting "influencers" to join in on panels, cosplay judging contests, etc. Which in turn pisses off a lot of the con's main audience as rarely are these influencers sufficiently knowledgable on the topics (ie little knowledge on costume making, barely aware of a given series, etc).

Few if any western anime cons have managed to get any sort of meaningful virality in terms of marketing, whether organic or manufactured. And especially little from the labubu type crowd given cons are more male dominated, and labubu far more of a women's interest.

The big thing labubus had beyond the gambling aspect was that its something you can put on your bag and actually bring around places, far more visibility than most other "viral" goods. It was an accessory.