Pre-IPO sales are limited to "accredited investors," people with a demonstrated net worth of $1 million or a yearly income of $200,000. It's been that way since 1982, when Rule 501 of Regulation D of the Securities Act went into effect.
https://www.wired.com/2010/07/st-essay-pre-ipo/#:~:text=Pre%....
In other words, the rich get richer ;)