It's unfortunate that I have to treat my ISP as hostile, but they are the only high speed provider to my address. I sadly can't even assume that there is anyone in management there that feels ashamed at their hostile practices. It's just "good business" to squeeze free ad dollars from your users as you take advantage of your monopoly position to keep prices as high as the market will bear while doing so.
[0] Even if I didn't prefer Bing, hijacking any of the major search engines just because it might be an "accidental default" and "no one would notice" is just wrong on so many levels.
[1] Scare quotes because it was 90% terrible ads and 10% barely legible search results from who knows what API.