Why do people think gta6 is going to sell a billion copies?

[angrypoolman]

PotentHerbs said:

I think 25M+ copies sold in its first week is very possible.

All the signs point to GTA VI blasting previous GTA records out the water. It may get a PC port quicker than GTA V, and it will for sure get another release with PS6/Helix.

what are the signs though? lol. this is where i am confused. i must be missing something.