This is a whole lot of what-iffing about a really straightforward idea. If you're going to incorporate my code into yours, and you're going to sell access to the resulting product as a web site, you need to make your code available. You can't host my code and your extensions on a website to evade the GPL.

Agree with this or disagree with it, but it clearly isn't a plot to get the GPL to infect program outputs.