I'm curious. What kind of information constitutes being tagged and treated as "confidential", but is nevertheless OK to send by email to a guy with a Youtube channel just because "he" asks for it out of the blue?
realistically unless its considered a military/state secret, its at the discretion of sales guys. There might be company bi-laws but they can probably be violated without repercussion if it looks like it will make business relationships. No actual engineer wants secrets because its always better to have analysis and technological developments, when you share information you get applications information and possibly design improvements. The more people know about something the more likely it is to be developed and more creativity is applied to a problem. If you get a creative sales application from someone, you can probably sell more product since the person that made the NDA has capital costs down.Or R&D costs go down when someone makes an improvement. It's like having another engineer on your team for FREE when there is no secret.
On the other hand, letting people know exact missile range or radar cross sections is a bad thing.
It would make sense to let Dave Jones know about a NDA because he is good at applications, is an active product developer (i.e. he sells test equipment he designed).. its not like he has a chip fab ready to pump silicon.. more like you might get some sales with parts inside of a gadget he designed. It might make a gadget sale possible if anything. Say you have a new isolation amplifier that he might make a ver 2.0 of the isolation probe with improved specifications. It's esoteric technicians tools...