SpaceX, Anthropic, and OpenAI are all giga-caps preparing to IPO, and none of them will be eligible for S&P inclusion because of the 12-month profitability requirement. At current valuations, all are part of the top 20 largest companies in the US. These companies may be excluded from the S&P500 for potentially years, until they reach 12 months of profitability.
And you are vastly overstating the effect of S&P500 fast track inclusion, the plan was to reduce it from 12 months to 6 months; which is more than enough time for the market to find a price.