In other equally exciting news the Earth is not flat and if you'll try hitting your head with a hammer with sufficient force - you will bleed and will break your skull...
To be serious I really don't understand the practical purpose for these videos (other than making more $$$ from YouTube Ads program) - the phone is still just a thin metal and glass and you can obviously scratch or crack it just like you, for example, can crack a thick bullet-proof laminated glass if you'll apply enough force to it. Would be more interesting to see such tests done in a lab conditions, with a same, specific amount of force being applied to different phone's (by different brands) displays, with specific tool at a specific angle.