247h, that's well spotted and very true but that's not really my problem with the domains.
After all, dotworlds is a commercial venture and giving away something for free -even if only for a limited period of time- is a legitimate tactic a company uses to increase customer membership/product exposure. In this case, the product is free until such a time that the owners feel it commercially viable to charge for the domains: the expectation is that so many people pile into dotworlds that the free domain names become too precious to give up and people are therefore obliged to renew after say, a year, for a realworld chargeable fee.
There's nothing wrong with this marketing tactic - except that in this case, I anticipate that the domains will never be worth purchasing and that if they do start to charge, it will only be when the venture is doomed. Then, they'll look to recoup at least some of the costs from their existing embers who are either too stupid to realise the lack of commercial viability...or those who, through hours of effort designing a
website hosting (that's why they make it free to design) hand over the dosh because of their sentimental attachment.
But 247h, it's a good point that their tactic appears rather sneaky and I think it's a good approach to be cynical.