https://www.techdirt.com/articles/20190927/10225543081/massive-study-proves-once-all-that-no-net-neutrality-did-not-hurt-broadband-investment.shtml

The biggest study (pdf) ever of its kind has found that net neutrality rules had absolutely no impact on broadband investment whatsoever. The study took an incredibly detailed look at CAPEX data for more than 8,577 different companies (270+ of which were telecom providers) and concluded:

"The results of the paper are clear and should be both unsurprising and uncontroversial. The key finding is there were no impacts on telecommunication industry investment from the net neutrality policy changes. Neither the 2010 or 2015 US net neutrality rule changes had any causal impact on telecommunications investment."