tallenge.comは安全ですか？

I received an automated message on Deviantart advertising this website, promising chances to earn money by entering art contests on Tallenge. However, their advertisements violate Deviantart's spam and advertising policies. No website offering a legitimate service would advertise in such a way as to violate the policies of another legitimate website. Also, according to Talllenge's license agreement, anyone who uploads to their website basically agrees to forfeit all rights to their work and make it royalty-free. The owners of this website can use and redistribute your work for a profit all they like and they don't have to pay you a penny for it. These people are professional art thieves. Don't be fooled by their bogus offers.