Another thing that i always wanted to know if the art submitted by the people who get the prizes, do those become the propriety of Roobet.com ?
I've won design contests before and the contest results are used by the contest owner for the logo of the platform, so I think any art from the contest win will be claimed by Roobet. The design results uploaded must be unique and attractive according to the rules above, professional designers usually will not use the same design for other contests so that the results of the art contest will absolutely belong to the contest owner, the prizes given are equivalent to your efforts to win this art contest.
As far as I know they are not getting the original file of the art and I didn’t see they use any art for their marketing purposes, this is solely for the purpose of contest. They are actually buying the physical art as they post an offer before, maybe they are planning to have a museum for the Roobet art.
I was able to win in other art contest before and they asked me the png file of my art, and they are also stating in the rules that by joining the contest you agree that the site will use your art for their future marketing. If Roobet is not doing this and still buying the art, then its a good one especially if you didn’t win but you intend to sell it to Roobet later on.