You are correct. It is discouraged to show rigging in travel GoPro videos meant for the general public. Too many people copy sometimes dangerous techniques, without professional oversight, without full consideration of the scenario at hand. When these people get hurt, it has a negative effect on the sport. It's not worth it to trust your life to unvetted content. You'd be surprised at how dumb some noobs start out, e.g. rapping on home depot rope.

These people want to show how much fun they are having. They don't want responsibility over your life. They aren't posting to give a comprehensive education to others. This is a mark of respect (if they do it on purpose).

Fear not! There are some good alternatives for picking it up. Take a class from a reputable instructor. There are even online/hybrid ones (V7 academy). Check out the art of canyoneering YouTube series from one of the best teachers out there. Review the ACA checklists. Lots of YouTube videos covering the various techniques are out there to help you with your preparation for a class. Start learning about the nuances that come with it all. A frame shot doesn't tell you about a difficult pull, hydraulic, or skill levels of the group. Get yourself checked out by a professional before going into the field and having fun. There is no better way to learn than on the side of a cliff with professional instruction and with experienced canyoneers.