Despite net neutrality provisions
There has been plenty of investment - Mediacom has upgraded its whole cable network to allow gigabit speeds, and Comcast is in the process of doing the same. AT&T is in the early phases of rolling out fixed wireless LTE in rural areas that are unserved by cable/DSL internet and have only expensive and slow satellite internet currently. They are also installing fiber in certain markets to replace their aging copper that can't be cost effectively upgraded.
So the argument that net neutrality prevents investment is obvious bullshit. Back when telcos said they needed big tax breaks to invest they pocketed the big tax breaks rather than using the money to invest in upgrades like they said they would. Their level of investment has never depended on what the government does or doesn't do in terms of tax breaks or legislation, but depend on the availability of technology that can be deployed at a price consumers are willing to pay.