they are allocating more tokens on social media campaigns because so many participants join, even you won't find big allocation to signatures, manager just wants to do justice to all campaign participants, even though it looks unfair to signature participants
We must understand that the market has changed and as such those campaigns have changed as well, a few years ago the market of cryptocurrencies was many times smaller than its current size so the strongest community that you could find to promote your projects was this forum, so the developers gave a greater weight to the signature campaigns in this forum, but now there are a lot of more people using social media trying to find information about cryptocurrencies and as such social media campaigns have become more popular and receive most of the rewards.
The determination of the allocation of campaign tokens is based on the results of the team's decision which is consulted within a few working days. So I think they made a decision based on a lot of considerations and needs of the company itself. The project they launched was more focused on gambling, maybe their perception was enough to just promote it in the signature section and in the social media section it was already known by the players, so there was no need to promote it anymore.