"On 26 February 2015, the U.S. Federal Communications Commission (FCC) ruled in favor of net neutrality by reclassifying broadband access as a telecommunications service and thus applying Title II (common carrier) of the Communications Act of 1934 as well as section 706 of the Telecommunications act of 1996[92] to Internet service providers.[93][94][95][96][97][98] On 12 March 2015, the FCC released the specific details of its new net neutrality rule.[99][100][101] And on 13 April 2015, the FCC published the final rule on its new regulations.[102][103] The rule took effect on June 12, 2015."
A core design principle of the Internet since the beginning has been the "end-to-end principle", which was that the job of the network was to distribute the bits between end points. FCC rules concerning network data go back to the 1960s.
The FCC began rule-making on network neutrality in the mid-2000s, in direct response to various ISPs blocking traffic.
Well, according to https://en.wikipedia.org/wiki/Net_neutrality#United_States this rule Pai wants to repeal only took effect in 2015:
"On 26 February 2015, the U.S. Federal Communications Commission (FCC) ruled in favor of net neutrality by reclassifying broadband access as a telecommunications service and thus applying Title II (common carrier) of the Communications Act of 1934 as well as section 706 of the Telecommunications act of 1996[92] to Internet service providers.[93][94][95][96][97][98] On 12 March 2015, the FCC released the specific details of its new net neutrality rule.[99][100][101] And on 13 April 2015, the FCC published the final rule on its new regulations.[102][103] The rule took effect on June 12, 2015."