https://www.forbes.com/sites/tonybradley/2016/11/29/att-joins-t-mobile-in-brazenly-breaking-fcc-net-neutrality-rules/?sh=4285126065c3
The way they have done it is not by restricting other services directly, but by continuing to apply bandwidth/quotas to them while bypassing them for their own services "for free"
https://www.forbes.com/sites/tonybradley/2016/11/29/att-joins-t-mobile-in-brazenly-breaking-fcc-net-neutrality-rules/?sh=4285126065c3
The way they have done it is not by restricting other services directly, but by continuing to apply bandwidth/quotas to them while bypassing them for their own services "for free"