The same license agreements exist for physical goods, smart guy. You have the right to use that product within your home, on your computers, without 3rd party intervention. You have a license to full personal use.
GOG qualifies this description. Steam doesn't.
Really, it's the same you say. Then will you be selling your games when you're done with them? Because that's what people with physical products usually do when they're done with them, or need money. Often sold to or by collectors.
I highly doubt it.
So where this 'the same' ownership you were talking about before included selling the product, with a GOG product that has suddenly gone out the window. It's already different. You're just conveniently leaving out the part that *you* don't care about, but regardless of that, it's not the same.
Basically people buying here at GOG have already pretty much given up their right to sell the game. They won't. Because no one will buy it, because you're not supposed to, as per the site's agreement. (whether that stands up in court or not).
That's a nuance difference that you just simply ignore here, yet is very real.
In the same way for me, I ignore the fact that control of my games is not 100% mine, if I leave it on a digital download. Because for me, all I care about is having access to it, from a digital download spot, when I need it. For me that's enough.
And the nuance difference there, is that the copy can, under special circumstances, possibly not be accessed or even taken away if I do stuff I shouldn't be doing anyway.
But the point here is, that from the point of 'owning' it on CD, to 'owning' it on Steam. It's just nuance differences. They're just different levels of ownership, none of them are complete ownership of the product.
And yes, this is about 'owning' something. The word owning. You simply don't.
What you're talking about is control. And the different levels of control you have over what you bought, and yes in that sense I'll easily agree that Onlive gives you far less control over your copy than Steam, just as Steam gives you far less control over your copy than GOG, just like GOG gives you less control over your copy than Retail.