Robinhood Markets (NASDAQ: HOOD) defeated an appeal by investors alleging the trading platform improperly blocked purchases of GameStop and other so-called Meme Stocks during the wild 2021 trading frenzy.

Customers claimed in the proposed class action lawsuit that Robinhood caused them financial harm by prohibiting further buying of shares like GameStop and AMC Entertainment as social media hype drove the stocks skyward.

But in a unanimous ruling Thursday, a federal appeals court said Robinhood’s customer agreement allowed the trading restrictions, which it imposed amid huge collateral requirements during the mania.

“When Robinhood restricted its customers’ ability to buy meme stocks, it took a sizable – and perhaps justifiable – hit in the court of public opinion,” wrote Circuit Judge Britt Grant. “But in this court, Robinhood is only accountable for specific legal duties.”

The decision upholds a lower court’s dismissal of the case alleging negligence and failure to maintain functioning trading systems. Plaintiffs alleged Robinhood’s trading halts caused meme stock prices to drop, hurting investors.

However, the court found the agreement gave Robinhood power to “decline any transaction at any time in its discretion.” The frenzy also led to a short squeeze causing hedge fund losses given their bets against meme stocks.

Robinhood remains subject to other lawsuits from investors who sold meme stocks at losses in early 2021 when restrictions froze upward momentum.

But Thursday’s ruling represents a major victory for Robinhood in limiting liability around the unprecedented trading mania, which saw inactive retail investors pile into stocks touted on Reddit and Twitter.

While controversial, the trading halts likely averted further systemic risks from the viral mania. Robinhood’s share price edged up 3 cents on Thursday following the legal win.