Greg has a long, unmitigated and unambiguous record of trolling, spamming, harassment, and abuse. Revoking his access to WMF resources in yet another instance was entirely correct and appropriate, although arguably it should have happened much sooner and more consistently. As Fred pointed out here just a few days ago, most recently, Greg openly solicited bids from "web manipulators" whom he intends to pay to post pre-written negative comments to news stories about Wikipedia, with a very clearly stated motive to drive traffic to his revenue-generating sites.
Thanks to the list mods for making the call. I appreciate that people seek for our organization and our projects to aspire to such a high standard of ethical behavior that even clearly unethical and profit-driven behavior and trolling is seen by some to fall within the tolerable norm, as long as it occasionally draws attention to issues that may merit discussion, no matter how much time and energy is wasted, and how much shit is thrown. That's not a principle that has ever applied to Wikimedia projects, however. If you miss Greg, you know where to find him, and I'm sure he'll return here frequently with throwaway email accounts as well.