Indeed. Developing countries might have more successful businessmen, programmers, entrepreneurs, etc., If they all have a fast internet connection. Having a slow internet connection or having a bad Internet service provider will not give you enough opportunities to keep yourself grinding in the world of crypto or your online business because you will only get limited access or will slow you down to keep your job done.
Now we have quality internet connection in every nook and corner of the world. Earlier, the internet users were dependent on broadband connection. It was expensive and the coverage was sparse. But with the advent of 4G, cheap mobile internet became available in remote and isolated regions. But in order to develop successful businesses, a fast internet connection alone can't do the trick. You also need skilled workforce, government support, good connectivity.etc.
good conectivity and fas internet is the same but you said internet speed is not the basis of success which is also true and i totally agree with that . maybe you mean to say connections to other people , the way you said good conectivity .
connections are also essentials to success because you can ask people or people you know can recomend you if they see that you have a skill on that area .