Altice, the European telecom giant, has entered the US market and is now looking to expand its advertising business. The company announced this week it’ll acquire Teads, the fast-growing digital video advertising firm that has wowed the publishing world. The news is the latest in a buying spree for Altice: it acquired a majority stake in US telco Suddenlink in 2015 and acquired cableco provider Cablevision in 2016. And like many other pay TV providers in the States, the company is now looking for new ways to monetize its expanding broadband footprint. It’s the latest in a string of ad tech acquisitions pursued by pay TV providers amid steady subscriber erosion. Late last year, AT&T announced it – along with…