The problem is they use reverse psyc, hidden triggers, double negatives, etc.
For example, I can't remember if it was Downloads.com or SourceForge, I recently almost installed Vosteran because the option to deselect the "extra awesomeness" was hidden in "Advanced Install" section and I had clicked on "Normal Install".
I've also seen plenty of "Accept Offer" with "Decline Offer" next to it, greyed out like it was disabled.
Plenty of examples exist of them TECHNICALLY giving you an opt-out - but hiding that opt out in every way imaginable.
I doubt it's a bitcoin miner. Probably some altcoin. Bitcoin mining is not profitable on CPU anymore, no matter how many general purpose CPUs you have at your disposal (fair approximation).
As far as I know uTorrent has hundreds of millions of users, it's not going to be amazingly profitable, but still significant revenue. (I don't see any recent figures, but they were at 150m monthly users over three years ago.)