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Apple fans are starting to return their Vision Pros
(www.theverge.com)
This is a most excellent place for technology news and articles.
That depends on the company that is selling the product, and the reputation of the reviewer.
IGN always give 9/10 for every game they review so they are high on the priority list to get review copies. But they won't get any if the Developer /Producer isn't interested in giving any out.
I don't think Apple is giving away 3500 devices for free to a long list of people. Most reviews I see are reviewing based on an extended store demo.