why
bitcoin is used instead of cash because bitcoin is growing continually while cash stable its value.
Attract peoples
the increasing price is the reason that attract people and increase the popularity of bitcoin, and that is the reason bitcoin gain trust of its users and that is why people invest more and more, because they know that bitcoin never fall.
you explain it very well.
let me add some more facts that made bitcoin more famous then cash.
1- as bitcoin is digital currency so it is very less chances to steal it. while cash can be steal at any movement, even bank will robbed.
2- bitcoin wallets are safest one and their security depends upon its users, stronger the passwords, maximum security.