Comment by porridgeraisin

Your ticket is tied to a particular platforms app. And you have to transfer it to another mobile number which also has to be tied to that particular platform. Both of you need to click accept or whatever in your respective apps for the transfer to go through.

Mobile number => single human has limited number of accounts and there is a limit to how many tickets an account can buy.

So scalping does happen, but only a relatively small limited amount.