Well they are all altcoins campaign and only pays in altcoins they are promoting instead of Bitcoin.This thread only contains signature campaigns that only pays in Bitcoin to promote up services or whatever.I hope you got the point.
Yes but same principle can be applied and for campaigns that pay in BTCs, there is no difference.
it has been asked before in here about a lot of other altcoin signature campaigns, but since this topic has always been overview of "bitcoin" signature campaigns, Mitchełł is not gonna add altcoin campaigns too.