Riding bikes is one thing...nobody is paying you for that and you're free to do as you will. When you work for a client, in my opinion, and by law in some cases, you should do everything you can to follow the rules, make sure you're safe, the job is safe, and everyone/everything in the vicinity is safe.
Those guys had some skill for sure and could be on their way to being fantastic arborists. But they'll never be there in my eyes without taking every precaution they can to make it home to their family at the end of the day. In that video they fell way short of that.