Unless I 100% own my 'answers' and my social network won't be sold, I won't use this.
I see there being value as an open source project, but if this is just a way to monetize and mine me and my friend's opinions then jelly can go jump in a lake.
When you give advice in person, do you establish a contract with the person you're talking to that establishes control over the information you just shared?
I'm being a bit facetious but unless the things you are answering are things that only you know the answer to, it's a bit silly to demand some sort of ownership over what usually amounts to basic knowledge.
Clearly, an aversion to mining in general is a fair argument against, but even if it were open source, third parties would mine it and use it for their own purposes, at least when you go directly with a company like this, they are beholden to their terms of service, and privacy policies, which I am sure is no consolation :)
No, this is not the expectation at all. Software developers should be paid for their work, but (sorry Hacker News) of all the popular funding models "VC-funded free service"(1) is the most hostile towards its users.
Terms can be drawn up so that you 100% own the content, but you grant the site a license to display your content on their site alone (and possibly indicate it must be only shown in original context, their search results, etc)
This allows full intended use but not ability to sell your answers to marketers, repackage as a book, etc.
Or they could go entirely in the other direction, and make all content on their site Creative Commons.
I see there being value as an open source project, but if this is just a way to monetize and mine me and my friend's opinions then jelly can go jump in a lake.