This advertisement is important for crypto related companies because casinos/mixers/etc cannot pay for sponsored links in Google/Facebook/etc, due to those companies policies.
Now I have learnt a new thing today. I thought deeply one day why don't the companies that promote their businesses or casinos here pay heavily to Google instead. I couldn't get any direct answer, here I have gotten a clue.
Then I now have a question; does the signature we wear in the forum has any promotional or visibility effects outside this forum?