Ajit Pai deemed the issue unimportant so they took no action Federally and then voted to kill NN. Eric Schneiderman, New York's AG, began an investigation since a bunch of the fake comments used real people's information, so they had an 'identity theft' nexus to state laws -- but Pai refused to aid the investigation in any way:
https://www.theverge.com/2017/11/21/16686644/eric-schneiderm...
That's the problem with electing people who don't believe in democracy or civil service, they have so many levers to use to dismantle things including just straight obstruction. Echos of the FEC's corruption, where several members tasked with upholding election law have decided they're just not going to do that, contrary to the professional staff who've indicated that laws were likely broken: