Not a very exciting question, because every business wants to have an "everything app". However Google failed, Microsoft failed, Apple failed. It's unclear why Elon believes he'd succeed, other than pure hope. Given his antics, people are starting to not trust him with cars and starting to turn away from his social media. So "everything" doesn't seem within reach.
Another recent example of an everything platform: Worldcoin. By none other than his former colleague and friend. Like X, Worldcoin is trying to take over key governance functions, namely identify database and finance. Creeps.