Everyone who participates in the caption thing that DdmrDdmr mentioned will received 1 from bitcoin forum. Those who didn't participate won't received merit. I also received 1 merit from bitcoin forum same as you. I think it's only normal since there's no exact post that will be merited that's why the topic is deleted/off-limits/ignored) plus the merit is from the forum but since there is no profile for bitcoin forum then when you click the sender it would only redirect to your profile.