WASHINGTON (Reuters) – The U.S. open internet rules expired on Monday, handing sweeping new powers to internet providers to block, throttle or offer paid “fast lanes” for web traffic, but a court battle remains ahead.

The Federal Communications Commission repealed the 2015 Obama administration’s landmark net neutrality rules in December by a 3-2 vote, sparking a firestorm of criticism on social media websites, opposition from internet firms like Facebook Inc (FB.O) and Alphabet Inc (GOOGL.O), and protests among Democrats in the Republican-controlled Congress.

New regulations that took legal effect Monday give internet service providers (ISPs) sweeping power to slow, block or offer “paid prioritization” to some websites as long as they disclose the practices.

The 2015 order subjected internet providers to strict regulations by the FCC, arguing consumers needed protection from internet provider practices and said internet providers could engage in “just and reasonable conduct.”

FCC Chairman Ajit Pai said last week the rollback will ensure more investment by providers and will ensure “better, faster, and cheaper Internet access and more broadband competition to the American people.”

FCC Commissioner Jessica Rosenworcel, a Democrat who voted against the repeal, said Monday that the decision put the FCC “on the wrong side of history, the wrong side of the law, and the wrong side of the American public.”

On May 16, the U.S. Senate, where Republicans hold only a narrow majority, voted 52 to 47 to overturn the decision by the FCC – which is currently composed of three Republicans and…

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