The contest is done regularly and is proven to deliver the price so it is not a surprised that it attracts a lot more participants. I even share the contest to my friends who are not a member of this forum. They got interested but I wonder if they will be able to submit their work

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You can submit on your friends behalf as you have account on forum but you also need to have Roobet account to mention your username on the casino as funds are transferred to your casino account.You can mention that you have submitted artwork on their behalf or they can register on forum as there is no restriction for newbies I think.
I told them to create an account for themselves so that they can receive the funds directly if they are lucky enough to be picked. Honestly, I don't want to be the middle person since I wanted them to interact directly, and have a personal experience of how things work. Whether they will be able to submit their work or not, is out of my concern, I already have given them the links and instructions so it is up to them to be responsible.
Curiosity isnt bad but there are really moments or times on which it isnt really that recommendable on dealing up with something specially if it does really look shady and its better to make yourself a little bit paranoid when it comes to security measure which is really that more better than on really that being too confident when it comes to security.This isnt only applying for account protection but also into that common wallet
on where we do store up our funds or assets. Always mind off about the security and safety because there are lots of hackers and scammers nowadays.
If a person is curious about some site and afraid that the site or link is somehow suspicious and may inject malware into the system then he can create a virtual system and access the site. Much better if he creates that virtual system on a separate unit to maximize protection. This way there is an extra layer of security to prevent these hackers and malware to corrupt his main system and steal his funds.