More likely than that, for the average user, is the fact that every contribution to a free, search engine indexed content site is 'unpaid work' and your content becomes the product that brings in new visitors and interest who search for the startup/web terms we all use.

Of course if you support a site, you'll be happy to help promote it. But what happens when you change your opinion on a matter that becomes important/illegal in the public eye, without the option to remove your now-offending content? Or if you plain just want to stop supporting a site? If people are guarded when making comments because of this risk, is the free service improved or worsened?

Email, picture or opinion, make no bones about it - our content is always product in some way. Content lock-in should rarely be tolerated. I'm surprised it is here, TBH. I happen to greatly appreciate this community, but I in no way agreed to give ownership of my thoughts in return for the right to interact. I'd rather pay with a content export/removal option than hand over the sum total of what little wisdom I have.