Why is the DOJ investigating Andreessen Horowitz’s board seats?

The Department of Justice is reportedly investigating Andreessen Horowitz for having two partners on boards of competing companies: Ben Horowitz at Databricks and Martin Casado at Fivetran. The probe, active for nearly a year, dusts off a 112-year-old antitrust law rarely used against venture capital firms. Board conflicts are common, and the companies may not have been direct competitors at initial investment.