It really goes like this:

I buy product. Product has no ads, and works really well.

After updates, my device starts showing ads and works worse than it had before.

I bought the device. It is my device. I should be able to do what I want with my device, that I spent my money on, the way I like it. If that means I don’t want your shitty ads, then I should be able to avoid or opt out of those by default.

From your thought:

You buy cookbook. Cookbook has what you need already, which is why you purchased it.

The one you purchased it from comes and “updates” your book by scribbling in ads for it’s other recipe books, and they did it really sloppily to boot.

Now, when you are looking for a specific recipe that you knew was in the book before, instead it is an ad for their other recipe book in place of where the recipe you were looking for was.

Sure, you can still find your recipe somewhere in the book, but as you flip through the books pages you see more and more and more ads for their other recipe books, and oh, now they are also showing you ads from some of their sponsors.

You paid for the book. It is rightfully yours to do with it as you please.

The recipe book company already got your money, yet they are insistent you buy more from them, and have even gone as far as defacing your book.

You should be upset.