You've answered your own question. “the selection is splitted” equates to “harder to stream” for anyone wanting to stream anything but the newest, greatest, most popular. Getting the full selection back requires signing up to multiple services and then having to search them for your desired content, thus getting “less quality and higher prices”.

You are, to an extent, correct that it's not exclusively Netflix’s fault, but I don't think entertainment pirates care about whose fault is what, they just wanna watch a show.