I think what you need to know here is advertising and what a signature actually is. I wouldn’t want to say much about the avatar because, it’s self explanatory itself as they are just logos and a part & passel of the advertisement.

Now signatures are codes that contains either or all of the following,
Link to the website, games offered by the website, running promotions, a projected project and lots more.

Now, you get to understand that as it is with advertising/campaigns, it’s broadly getting the word out to drag attention to a project or service. You might see the forum to be that nucleated but, it’s actually the largest crypto concerned forum in the globe and have got a whole lot of persons both anti and pro cryptos here, ready to patronize crypto involved projects and services.
Comes patronage comes fund generation and consequently, funding an escrow to run a signature campaign.