The impact was mitigated somewhat by states adding their own NN legislation. There has definitely been an increase in zero rating certain services like Spotify etc which creates new barriers to entry for smaller businesses though.
That said even this would hardly count as a negative for users though you're spot on about it hurting competition for other streaming services - on the other hand it's a way for ISPs to compete. Hmmm... still haven't formed an opinion on this issue yet.