Yes, but those are not reviews. They are hands-on, and htc can't do anything about those vids because they don't have any leverage over the people who post those vids.
With reviewers, htc can exclude them from future events and blacklist them from receiving future pre-release phones if they break the review embargo, so reviewers are more likely to want to get on HTC's good side and not release them before the embargo lift date.
There was this huge drama with htc and Dutch reviewers back on Monday. I'm not sure if you know about it, but I'll explain anyway.
Originally, the M9 review embargo was set to lift 2 days ago on Monday. However, htc delayed the M9 release date and told reviewers that the embargo will be lifted at a much later date.
Apparently, one Dutch review site didn't get the memo and released the full review on Monday. Since all the review sites had an agreement to break the embargo if any one of them broke the embargo, the other Dutch sites, including the now-famous tweakers.net, released their reviews.
After finding out about the reviews (Oh, and they were all flogging the M9 for being more of a downgrade than an upgrade), htc threatened the reviewers to take their reviews down. All of them complied, but tweakers.net decided to man-up and told htc that they wouldn't, because they didn't break any agreement.
There was this huge argument on reddit with one of the senior editors of tweakers and some rep from htc regarding potential lawsuits. It was hilarious and amusing, but I don't wanna go into detail about what they said, because I don't wanna type all that out.
In any case, the guy from tweakers told reddit that the excuse htc gave for the embargo delay was about some boot-loading sequence. He predicted that what they reviewed is how the final build will be.
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