It is hard to find anything relevant to Google+ now because of the amount of shit content, however here is one article from 2011: http://www.forbes.com/sites/adamhartung/2011/06/30/why-googl...

Around that time there were a bunch of them with some people even trying to make a case for shorting GOOG.

OS X. Now free

That's completely different. OS X is not really free, the same way iOS is not free. It just comes bundled with the hardware and you get updates till the EOL of the product.

Much like Android. It's free for 12 months or so, after which your product support is shrugged off.

No, I was referring to investors wanting G+ killed. Which investors, where (and recognizing you're not the OP).