Like the Duelbits signature campaign for example, it's already week 120 and recently the Duelbits devs have also increased the number of participants from our fellow forum members. Probably such campaign signatures are quite effective.
Or they just want to stay noticed, as the amount of gambling signature campaigns or gambling sites are increasing all the time. Take for example mixer signature campaigns. Mixers are needed, they are demanded, but we dont see a lot of mixer signature campaigns. Probably we have 2-3 and about 2 campaigns that are running for lot of weeks. Demanded, "signatures are effective", yet mixer signature campaigns are rare. Strange, isnt it ?