Antitrust laws were written in the early 1900s and updated through the 1950s. Credit cards weren't available until 1966 and didn't become widely used until the 1990s. Digital platforms weren't a thing until the late 90s/early 2000s and the Apple app store didn't exist until 2008.
The courts can only enforce the laws on the books. Congress needs to update the laws, but they won't because they are hopelessly corrupt :(
Lina Khan did try and regulate. She had some successes, but the major cases w/r/t concentration of power against Microsoft, Amazon, Google, Meta and Apple have all moved slowly and (so far) failed to result in break ups.
The courts can only enforce the laws on the books. Congress needs to update the laws, but they won't because they are hopelessly corrupt :(