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By far the most likely *initial* way they use is by looking at the domain creation date (followed by certain signature tests to validate the initial test). However I am told that this date is frequently changed by some registrars when their database changes for example. In other cases, I am told that this date can be masked. If this is true for example, then Google have a LOT to answer for.
In an effort to try to "improve the user experience", Google is going to hurt a lot of innocent webmasters, who provide both the content and revenue on which their future success depends. I think it is in ALL of our interests to expose ways to DEFEAT Google's new expired domain catcher and teach them that trying to automate this process, rather than dedicating human resources to accomplish it manually is NOT a viable long term option for them.
Google's power allows it to hurt the businesses of anybody they see fit without any explanation whatsoever. Our power as SEOs has always been in keeping search engines honest by exposing and using their own unfair tactics against them.
This would not be the sort of project you could just throw bodies at. It just does not work that way.
Human wave programming does work, but it only works for large systems, which this is not. There is no where near a linear increase in productivity for each added body. For something like this, managers, design teams and senior programmers are VERY counter productive. Each extra person adds project management time to each persons schedule.
You seem to be under the mistaken impression that you can "manage" software into existance. I have seen it too many times, someone puts some numbers into Project and they think that those numbers represent something real. It just ain't so.
I give up. I'm not going to convince you any more than I was able to convince any other managers that I did not work directly with.