The relevant indices (S&P500, Vanguard) buy in proportion to available float -- i.e., its market cap is weighted by 5%. Only Nasdaq 100 ignores float, stupidly, but almost no money, especially 401(k) money, is in that.
This may be true (I'm sure it is, but I haven't verified) but the large majority of people do not know this, which is why hearing "my retirement account is going to be forced to by a bunch of spacex at a $2.5T valuation" makes them.... uneasy.
Musk tried mightily to get S&P to change their 12 month rule to 15 days but they refused. Nasdaq, however, caved to Musk and agreed to change the rules of its Index - from a 12 months wait to 15 days - in exchange for Musk agreeing to list SpaceX on Nasdaq's exchange.
There are ETFs that were issued tied to the Nasdaq 100 which are therefore legally bound to buy SpaceX. But the biggest immorality is the SEC allowing Musk's attempt to manipulate the market by:
1. Setting an IPO price for SpaceX (which absorbed xAi and its money guzzling losses) at unsustainable, incredibly inflated prices; and then
2. Putting incredible pressure on SP500 and other index makers to change their rules to force the purchase of SpaceX at those sky high prices (in an IPO, company gets to set the IPO price).
It's legal. At least in the eyes of the SEC which, of course, is an institution that is controlled by the wealthiest who control the markets, so of course it's legal.
But it is outrageous market manipulation that is fraudulent in its intent to enrich the wealthiest man on earth at the expense of ever wage earner putting her money into Index Funds.
Thank goodness the S&P and CRSP refused to change their rules. Otherwise the shifting of risk from Musk onto the shoulders of every working American would have been complete.