Xyz used to be the cheapest domain it's mainly used by Ponzi and MLM operators a wallet will not and should not use this domain name
But some greedy man who are looking for a bucks for free don't care what the domain name is used to making the giveaways. xyz domain is not only very cheap but also some domain provider give them as free.
btw the site maybe down already, I can not access it anymore. Some bad dishonest people are taking the advantage of boosting feature in Facebook to promote there scam trap. in this modern world if people don't care to keep secure in internet then we can not do anything tbh.