Because IP addresses are NOT scarce. They are so plentiful and so cheap that a single residential user will get a /54 block containing 18 billion billion IPv6 addresses.

There is no catch. All you have to do is use IPv6 (which you are already using unless you have explicitly turned it off). Many people have IPv6 network traffic running on their networks without even realizing it because it is included by default with every operating system.

The article that was posted only refers to the old-fashioned simplistic IPv4 addresses and they are only still in use because too many graybeards want to stick with what they learned 30 years ago. Learning new technology is not that hard. Run with it.