Gains from a hypothetical buy and subsequent sell that never happens? That’s way too big a stretch, and makes no sense.

Unrealized gains don’t exist, and read their TOS, this was inevitable. Robinhood is just one of many brokers limiting their exposure to a highly volatile stock of little intrinsic value with temporary trading halts.

You are lucky the NYSE hasn’t shut down BME trading for all of February. Yet.

RH prevented users from closing positions and realizing gains?

Read up on what T+2 settlement period is. When you buy GME Robinhood is on hook for two days before it closes and has to post collateral with the clearinghouse (DTC) during that time. As BME volatility exploded the collateral demanded of Robinhood skyrocketed.