I'm not actually making that argument, I was thinking in terms of economies of scale or just that some features or services are so cheap and incidental for a huge player that they end up squashing minors almost by accident. In those cases you can make a case they are doing harm, but being alive causes harm (environmental for example). You've got to draw the line somewhere.

Dumping is tricky. I am actually sympathetic to the argument that says let them dump away. If China is subsidising cheap solar panels and manipulating their currency to make them even cheaper again, fine. Let's gorge ourselves on cheap solar panels. That's fine in theory, but the reality is more complex. What about long term investment in technology development? Control of strategic technologies? These apply to tech services too. I use Google Doc heavily, but I do worry that they are pricing out potentially innovative competition.