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Photo courtesy of Barron's

Just as Big Tech has begun to seriously worry about Washington, now Wall Street is waking up to possible government threats to the market dominance of the Silicon Valley giants.

While the "biggest companies don't face an immediate threat of being broken up ... just the possibility creates a risk factor in the stocks," Barron'sreports in its new cover story:

  • "More than antitrust issues are in play. The huge amounts of personal data that Google, Facebook, and Amazon are amassing is just as troubling to some."
  • Why it matters: "Taken together, these challenges threaten the stock valuations of the group. To get an idea of the worst-case scenario, take a look at two of tech's dominant players from previous eras: IBM [1969] and Microsoft [1998]."
  • "If these giants get sideswiped, it could be because of the fatal flaw in large tech companies that's often drawn social ire and regulation — the will to exploit their dominance."

Possible hits to the platforms' business models are blossoming in Europe, and the contagion could spread across the Atlantic. An AP takeoutfrom London points out that the giants "are increasingly facing an uncomfortable truth":

  • "[I]t is Europe's culture of tougher oversight of companies, not America's laissez-faire attitude, which could soon rule their industry as governments seek to combat fake news and prevent extremists from using the internet to fan the flames of hatred."

Be smart: My conversations with tech execs show they're skeptical that Congress will figure out the mechanics of inhibiting the platforms in a way that would do serious damage to the bottom line.

  • It's true that potential D.C. action is in the early stage. And there are huge impediments to doing anything radical. But the companies are now such tempting targets, this is a rising passion in both parties.
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Go deeper

Updated 36 mins ago - Sports

In photos: Tokyo Olympics day 6 highlights

An underwater view of swimmers including Team USA's Caeleb Dressel (R) in the final of the Olympic Tokyo Games men's 100m freestyle on July 29. Photo: François-Xavier Marit/AFP via Getty Images

There's been plenty of Olympics drama on day six of the Tokyo Games Thursday — notably China's women's swimming team beating the U.S. and Australia in the record-setting 4x200-meter freestyle relay.

The big picture: Katie Ledecky helped the U.S. win silver, which also beat the previous world record smashed by China's team. Team USA grabbed two more swimming gold medals, when Caeleb Dressel won the men's 100m freestyle and Bobby Finke triumphed in the first men's Olympic 800m freestyle.

Updated 1 hour ago - Sports

Olympics dashboard

Team USA's Simone Biles during the women's team final on day four of the Tokyo 2020 Olympic Games at Ariake Gymnastics Centre on Tuesday in Japan. Photo: Fred Lee/Getty Images

🤸🏾‍♀️: Simone Biles reacts to "love and support" after withdrawing from all-around gymnastics and team finals, citing her mental health

🏊‍♂️: Caeleb Dressel wins gold in men's 100m freestyle —Bobby Finke wins gold in first men's Olympic 800m freestyle

📷: In photos: Tokyo Olympics day 6 highlights

🗓: The Olympic events to watch today

🎾: "This one sucks more than the others," Naomi Osaka says on upset loss

🏃‍: Female Olympians push back against double standard in uniforms

Go deeper: Full Axios coverage - Medal tracker

Updated 3 hours ago - Sports

China wins Olympic gold in women's 4x200m freestyle relay, sets world record

Junxuan Yang, Muhan Tang, Yufei Zhang and Bingjie Li of Team China react after winning the gold medal in the women's 4 x 200m freestyle relay final. Photo: Al Bello/Getty Images

China grabbed Olympic gold in the women's 4x200m freestyle relay, in a surprise record win in Tokyo Thursday.

The big picture: Katie Ledecky made up time as Team USA's final swimmer to help the U.S. take silver. Australia, which was the heavy favorite, won the bronze. All three teams finished ahead of the previous world record pace.