The number 7 is seen as lucky in slots and pop culture because it’s tied to...

https://chancessmartperspective.nexorafield.com/posts/what-is-a-megaways-slot-and-why-was-it-mentioned-with-mrq

The number 7 is seen as lucky in slots and pop culture because it’s tied to tradition and patterns we recognize, like the classic 777 symbol on reels