IIRC I heard years ago that Turbo "pays" the streamer for the non-watched ads which have been removed for the Turbo user, i.e. fractions of a cent, i.e. nothing. All it does is paying Twitch for doing fuck-all.
So Turbo pays the streamer the same amount per stream as the non-Turbo ad supported account? That sounds good and fair. I don't know why you would expect otherwise.
Heck, Turbo users probably watch more videos and so are better customers even at the same rate.
Heck, Turbo users probably watch more videos and so are better customers even at the same rate.