Alright, I did the google search based on your incendiary comment and whatever you're trying to suggest does not seem to be the case.

pg 79: https://democrats-financialservices.house.gov/uploadedfiles/...

"Apex provides these same clearing services to many other introducing brokers, including Ally Invest, Betterment Securities, M1 Finance, Marcus by Goldman Sachs & Co., SoFi Securities, Stash Capital, Tastyworks Inc., TradeZero America Inc, and hundreds more"

There are some Reddit threads about this - https://old.reddit.com/r/Superstonk/comments/1dz57am/trade_3...

Take them with a grain of salt.

we gettin a fan made doco on it, https://www.youtube.com/watch?v=opDJq1fnoRM