77 hand is easy laydown. I play in a kinda crazy game with a lot of straddling and I've open-folded 77 a number of times from early position knowing I'll get better opportunities to get my money in. The hand where you saw his cards - if I wasn't in the hand, I'd tell them but otherwise I'd take advantage of the free information.
Why not say to that guy with the JJ that you have seen his hand? I would not want to win like that. It feels a bit like robbing an old granny of her purse. Not cool but hey it's just my 2 cents. However one thing that is speaking for you is that your opponent should pay attention that nobody could see his cards. But he was probably distracted with his online poker game. And finally why do they allow someone to the table that is playing online poker when playing live? It slows the whole game down and he could also watch some solvers in between hands. Nice vlog and nice win, except for the AK vs JJ hand.