The assessment is primarily based on a highly authoritative and directly relevant source from Forbes. This article, with an authority score of 0.95 and relevance of 1.00, explicitly states that 'Elon Musk became the first person ever to be worth $600 billion.' Forbes is a well-established and credible publication for tracking billionaire wealth, making this a very strong piece of direct evidence.There is conflicting evidence from a Wikipedia article, which cites the Bloomberg Billionaires Index and reports Musk's net worth at a lower figure ($470 billion) at an earlier date. However, this source has a lower authority rating (0.60). Discrepancies between major wealth trackers like Forbes and Bloomberg are not uncommon, as they use different methodologies to value private assets like SpaceX. Given that the Forbes article is a primary source directly addressing the specific claim, it carries more weight than the contradictory figure from the secondary Wikipedia source.The remaining relevant sources are low-authority social media posts that are speculative and forward-looking, discussing a potential future IPO. They do not confirm or deny the claim that the milestone has already been reached. The other provided sources are entirely irrelevant to the topic.Therefore, based on the strength and directness of the primary Forbes source, the statement is assessed as likely true with high confidence.