Sadly I can't help you there. The NDA will be in effect for the duration of the closed alpha. You can stream when it goes into early access though. Just the closed alpha will remain under NDA. Why isn't that an option to just play a bit without streaming?
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Vlogs are something the team would like to make more of at some point, but can't say for sure. I believe the blogs are usually much easier to fit in with scheduling.