[1] On the weights, all boards - of
all brands - are handmade, so there are weight differences inherent to hand lamination.
Their weights (with min and max) are listed on the Gong web pages, and a rebate is made on overweight boards. For instance I bought once a overweight board (first batch was at +10% weight) at a 30% rebate as I was eager to test a new shape.
Currently the range of weight is -5% to +5%, that is a range of 10%, so yes, a board stated for 10kg can weight between 9.5kg and 10.5kg. A 1kg range.
You can see the boards outside of this range listed in the "good deals" section, discounted now at -33%, they are not even listed among the normal boards to avoid confusion.
So why the hate? You will have a hard time to find more transparent brands on this.
Note that for a long time, Gong was the only manufacturer to even commit to state the weight on their pages. Even today, some SUP manufacturers do not even list the board weights (even some praised highly here), or not a range of weights, although it is impossible to have the exact same weight on all boards.
Do the experiment: go to the SUP brand sites, and look for the weights... you will be surprised.
[2] As jonysan explained, they refuse to participate in reviews where the manufacturers are asked to pay to get a good review. Most of the time this is by asking for buying an ad in the magazine, or on the site, or becoming a sponsor of a site. They stated many times this policy on their site and forum. And they have lawyers to make their decisions respected, instead of behind-the-scene dirty tricks.
(Note that even though not an employee of Gong, I have been banned from an US SUP "brand neutral" forum because its owner wanted me to pay $600/year to be able to post on it...)
I even saw the emails of an "influencer" trying to blackmail Gong by wanting some free gear, otherwise they would badmouth Gong on their videos. Knowing that "The Bear" although a "gentle giant" has been a nightclub bouncer, I think it was a very bad idea :-)
But you can see there have no issue with independent reviews, as a most recent example SUPboarder did some this year. But they never asked money from Gong, I guess because they do not rely (only) on ads, but mostly on subscribers.
supboardermag.com/what-are-you-interested-in/?_site_search=gong