What would be the challenge for US to implement this idea?

Super-apps have not found success in the American market due to a number of factors, including different growth paths and market positions, regulatory, technological, and cultural contexts, and organizational and financial reasons.

The tech leader is also afraid of feature bloat, which occurs when too many features are added to an app, causing it to slow down and become less engaging for users. This can also lead to some functions being seen as "second class" in consumers' minds.