No. WSB is not "a regulated entit[y]" that "disadvantage[d] investors or otherwise unduly inhibit[ed] their ability to trade certain securities". Robinhood is and did.
1. preventing people from buying GME at, whatever, $300 might not have been disadvantaging them, and
2. it might not have been unduly inhibiting their ability to trade, but duly so.
Your bias even makes you defend Robinhood’s action to disable cash accounts buying certain stocks as DULY.
Wow