I am wondering what this "notice" is really about. Didn't all ggl-based parking companies explicitly prohibit traffic generation to parked domains, including but not limited to forwarding of one domain to another, even before this "notice"? Of course it was "public" face, as, privately, many companies elected not to notice unnatural domain traffic in the best case, or - in the worst case - approved "traffic arbitrage" if the customer makes them aware that the traffic is generated and how. I myself experienced this (once got a new account manager at a large ggl-based parking company, and he routinely - as a part of his hello-introduction - asked me about this so that he could mark my domains internally as receiving good traffic).
The whole notice lacks common sense. For example how can one digitally sign "no bot traffc whatsoever" condition in current environment where parked (and any other domains) are bombarded with bots that are either looking to hack the site (requesting wp-login.php and similar urls) or simply grabbing everything? Ggl may or may not like it, but this is what really happens.
I am especially worried about "8" (the entire domain need to be parked). Should this be interpreted as they want to shut above.com parking manager down, since above.com customers are doing exactly the opposite - if the traffic is distributed between various parking companies, no parking company can say that the "entire" domain is parked with them... The same applies to inhouse parking management solutions (I also have one), which in my case is technically the same as above.com but the distribution rules are much more complicated
I'd prefer to interpret "8" as no-no for hosting companies to show parked domain ads on 404 pages if the hosting customer failed or forgot to setup one. Isn't it what a number of large hosting companies are still doing, or at least were doing some time ago? In particular, Endurance-owned hosters
As a side note, the whole "notice" may well be parkingcrew-specific and should probably not be interpreted as another "global bad news" from ggl. (are there any good news from them for domainers at all?). It may well be that ggl noticed too many bad business arriving from parkingcrew customers, but elected to send such a notice first, instead of shutting them down immediately as they did with domainsponsor... The time will tell