How difficult is it to integrate a system like this if a platform already has some existing game providers connected?

Hi there, I found this after browsing a thread about how platforms quickly expand their game libraries. One user shared casinoapi.solutions, and I decided to check it out. What stood out was the ability to access 5,000+ games through one API. I liked how straightforward that idea was presented. It didn’t feel overwhelming, just a logical way to simplify things.