The reason why is that you don't see this any more.
As the video explains in China and Chinese society it's custom to fight over bills. The video is NOT exaggeration. Back in the 1990s when biz was good families would meet every Sunday or Tuesday eat bitch about how society was falling apart. Bitch about their children, bitch about how business was crap. Note a Chinese business man will ALWAYS say business is crap this is partly due to self preservation though. But at the end you would quite literally see parents fighting over bills. Rather than sit back and enjoy the free lunches. They would go hand to hand against each other. Since my dad's generation is of the 1970s Bruce lee picked on group in the UK, although it is a cliche almost all of them have some Wushu ability.
You would quite literally see people fight like this one handed
If you were not the one handed the bill, one hand would fend off the defender's hand and the other attempt to grab the bill. If you were the defender it was doubly hard as one hand was used to fight off the others and attempt to reach for your wallet and put the money down.
In a manner not dissimilar to how Jackie Chan defends his Chicken
Meh Halcyon days....