Adding to the comments above, signature campaigns of trading sites are more reliable than those of gambling websites. Gambling websites shut down often and earlier when I was a member of a dice gambling site's campaign, which lasted for a few months and then I couldn't get into bitmixer/bit-x as slots had been full.
It's better to choose to promote trading sites else you can try getting in primedice campaign where they give bonus rewards for those wearing their signature and avatar.
AFAIK, primedice already stopped their signature campaign a long time ago, and people who wearing their avatar and signature was for their giveaway.