I'm not sure if this is more than the early version of duelbits' campaign but it looks like it is.
Duelbits were accepting 115 members back then, so Rainbet breaking the record for becoming a signature campaign with the highest participants of all time.
Oh, thanks for clarifying that. That only means that it's rainbet that's currently the record holder for having a lot of participants.
And who knows if there will be next announcements of additional members. Because they seem to be in a momentum and the brand does likes how the marketing goes with their campaign.