I will try to be as unhater as possible in this commentary.
As someone who works with social media, design, advertising and marketing, I understand well what exactly you are trying to do and I am not going to complain about your standards, and your methods.
They are already asking as a regulation that we do free advertising of an application in our social networks, it's like asking a person to make them a Single for their brand and demand that this will be included in their next music album, but okay I guess they do not find what's wrong with this.
The next thing is that as a suggestion, nowhere do you indicate if we must be users of your app or how the payment of the prize will be made, this should be clarified even briefly in any contest.
Finally and with all due respect, do not know how unsafe it is to enter a Discord server somehow associated with cryptocurrencies, even Hive servers are plagued by unscrupulous people looking for unsuspecting people to scam them; Is it too much to ask that you add to the bases of your contest what is necessary to do the job?
You are practically leaving people a job offer, telling them that you want them to use specific tools and not supplying them; The right thing to do would be to leave the Hex of the colors you want to be used, the logos in PNG, or a brand manual that designers and illustrators can be guided by (that's what brand manuals are for), leaving a Discord link for those interested to investigate may even be disrespectful.