It’s a benchmark of the market under certain rules, like having multiple quarters of earnings for the market to value them at.
These companies want special exceptions. If you are an exception why should you be included in a benchmark? At best they should have an asterisk against their name like Sammy Sosa or Mark McGuire if they are not following the same rules.
Your baseball cheating analogy makes no sense here. Rules against corked bats / steroids exist so people don't cheat at a sport and all players can compete equally. S&P rules are supposed to make the index reflect the market. Totally different.
The profitability requirement is something made up by the S&P committee. If that rule ends up excluding trillions in market cap, the rule has defeated its own purpose. The 12 months of profitability requirement punishes high-growth companies that invest their FCF into growing the business vs taking profits.
It excludes companies like Amazon, which when ran by Bezos, was famously unprofitable and invested all free cash flow into growing the business and never turned a significant profit until >20 years after its founding.