I guess it’s up to you if want to trust it or not. He doesn’t share all the details, but he (at least in the past) shared enough details on his blog that I felt pretty good that he knew what he was talking about it.
I will point out that he was one of the very few aggregators in 2016 that was saying “hey look, Trump has a very real chance of winning this”. Which is why I find it so amusing when people say he got it wrong in 2016 when in actuality he was one of the few that was right. After 2008 there were a bunch of copycats out there trying to do similar things as Nate Silver, and many of them were saying things like 99.99% Clinton. If people are going to criticize, that’s where I would direct it.
You’re using a weird definition of profit, which to most people is some sort of financial gain. Saving money isn’t the same as profiting. You’re not turning a profit when you use a $1.00 off coupon on a package of Oreos at the grocer just like you’re not turning a profit if you download a movie.
Also, go look up criminal copyright infringement. That’s what is defined as a crime legally, and downloading a movie or a CD doesn’t meet that threshold unless maybe you’re torrenting it and therefore distributing it. Morally, well you can argue that, but not everyone is going to agree with you.