Venture capital firm Andreessen Horowitz is the focus of a Justice Department antitrust probe over whether its investment partners are improperly serving on the boards of competing artificial intelligence companies, according to people familiar with the matter. The companies at issue include Databricks Inc., one of the most valuable privately held technology companies in the world, and Fivetran Inc., both backed by the VC firm, according to the people, who asked not to be named discussing a conf...