Google has been hit with a third antitrust fine from European Union regulators over alleged antitrust violations related to ad sales, as calls to break up big tech grow.

European Commissioner for Competition Margrethe Vestager tweeted Wednesday that the EU fined Google 1.49 billion euros ($1.69 billion) for “illegal practices in search advertising brokering.” She claimed the Mountain View, California-based company misused its dominant position in search ads—holding more than 70 percent of the EU market from 2006 to 2016—by imposing “contractual restrictions on third-party sites.”