what would concern me for the short term would when they halt trading. It's happened several times already to GME.
Traders think they can be fast enough to get out if it turns against them, but when they halt trading, the stock freezes for an hour(no trading is allowed at all), the market makers tabulate a new price to re-open trading at based on the current buy and sell orders that have amassed, and the new price is set. Commonly that price is drastically higher or lower than where it was before the halt. And then the stock could be halted again very soon, compounding the effects.
Sometimes that price it was last at before the circuit breaker triggered (halting of the trading of the stock) is the last time that stock will ever see that price again in that the stock continues to sell off and being a floundering business, eventually gets bought up, de-listed, and/or declared worthless.
Course, Robinhood investors may come to realize this before its all over.