S&P500 held fast to their rules on consecutive quarters of profitability and forced TSLA to meet them (must be profitable in qX + sum to net profit over the past year). If they hold to them this time, SpaceX would need to be profitable over a year while public to enter the index.

They have instituted rules and gone back on them eventually (most notably for several years they had a "no going public with different classes of voting shares designed to allow control forever, if IPO is after today" rule that they eventually dropped) but they are generally pretty good about following rules.