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Yep. You don't even have to submit your site to get included. All you need to do is mistakenly type the URL into the search bar instead of the address bar.
I have no idea what you are talking and how its related to the current issueThat is to say that we don't see that the sandbox exists as we understood it.
Do this: Search for your keyword with 100 results, go to the last page... you on it? Depending on who you talk to, that's a sandbox of sorts.
There could be several reasons a page ends up there but if you think it was the Q&A links, can you get remove them yourself?
If it were that easy, everyone would do it.
You need to look at the pages ranking above you, and figure out what they may have that you don't.
How old is the site in question?just a little more than a year. 1 year 2 months exact.
Other than the somewhat sketchy links you built, what is the rest of the site's backlink profile like?Nothing much. Actually the quantity of mentioned backlinks are also small but the problem is there are no quality backlinks. But so for other sites on the same niche.
And going by your content generation description, Google just might not think it's unique enough.
Sandbox applies to new sites...
Matt Cutts Confirms Sandbox Exists for Some Industries
So, for some sites, in effect there IS a sandbox.