Facebook’s cryptocurrency announcement has drawn widespread ire from lawmakers—but at least CEO Mark Zuckerberg‘s longtime rivals are happy about the tech giant invading the crypto sphere. Twins Cameron and Tyler Winklevoss spoke out about Facebook’s new cryptocurrency, Libra, for the first time at an event at New York’s 92nd Street Y Tuesday. And the twins have a surprisingly welcoming message for Zuckerberg: “Welcome to the party.”

Per Bloomberg, the Winklevoss twins, whose infamous involvement in the early days of Facebook has given way to a cryptocurrency career as the founders of crypto exchange platform Gemini, are only surprised that Facebook didn’t get into the cryptocurrency game sooner. “What took you so long?” they asked Tuesday. Facebook’s new turn toward cryptocurrency has been “very good for crypto and very good for Bitcoin,” Tyler Vinklevoss said Tuesday, noting that a high-stature company like Facebook “talking about the word ‘crypto’ demystifies it, takes out some fear for some people.” “It might add other fear for different reasons, maybe privacy or whatnot—but the fact that a publicly traded company that’s a huge part of our economy actually is doing something really serious in crypto very much mainstreams it and I think it’s a big win for our space,” Winklevoss continued.

The Winklevii’s Libra praise comes as Facebook’s planned cryptocurrency has come under fire from lawmakers around the world, who fear the repercussions of the powerful influence Libra could wield. The new cryptocurrency, the House Financial Services Committee wrote in a July letter to Facebook, “pose[s] systemic risks that endanger U.S. and global financial stability.” The Federal Reserve became the latest entity to express concern about Libra, as chairman Jerome Powell told the House Financial Services Committee Wednesday that the platform “raises many serious concerns regarding privacy, money laundering, consumer protection and financial stability.”

To the Winklevoss twins, though, Facebook’s embrace of cryptocurrency is the harbinger of a new future, in which all tech giants are making their own cryptocurrency moves. “Everybody is coming into crypto,” Cameron Winklevoss said Tuesday. “In the next two years, every FAANG—you know, Facebook, Apple, Netflix, Amazon—are probably going to have their own coins or projects and they’re probably watching Libra closely to see how it fares.” Tyler Winklevoss added that the twins’ “thesis is that the space is here to stay and it’s only getting bigger.”

Of course, for as much as the Winklevii herald Facebook’s new cryptocurrency, Libra marks yet another chance for Zuckerberg to steal the “Bitcoin Billionaires”’ spotlight and best them at a game they pioneered. Though the twins’ pivot to cryptocurrency has been successful, it hasn’t been without setbacks: their record-breaking $1 billion in bitcoin holdings was short-lived when the market tanked, and the Security and Exchange Commission twice rejected the Winklevoss’s bid to create an exchange-traded fund for bitcoin. Now, the twins could face another challenge from Zuckerberg, whose cryptocurrency will likely be a direct competitor to the twins’ own Gemini dollar. With Facebook’s potential to totally shake up the cryptocurrency market as it currently stands—in which the Winklevoss twins are king—it’s possible that Zuckerberg, to quote his infamous Harvard-era instant message, is “going to fuck them” once again.

While the Winklevoss twins may so far be taking Zuckerberg’s infringement on their cryptocurrency turf in stride, though, the reality that Zuckerberg is once again on the twins’ heels may not be lost on the Facebook CEO. “I believe there’s no way that Zuckerberg is looking into crypto and not thinking about the Winklevoss twins,” author Ben Mezrich, who profiled the twins in his books The Accidental Billionaires and Bitcoin Billionaires, said in a May interview with Vanity Fair. “There’s no way that’s not in the back of his mind somewhere.”