Sometime ago the sg team explained that they were creating "fronts" in the address for every domain you can use with sg, so if someone receiving a disposable address from you loads the address on their browsers, they don't realize it is one.
I don't know if the page for neverbox will actually be put online, but "coming soon" is probably better than redirecting to sg from their point of view (or maybe 'coming soon' is actually the page
).