I watch anime on Crunchyroll.com (it's all legal and licenced!) and, because they're paying for it and need to make their money back, there are ads.
I don't mind the ads. I'm even okay with the unskippable ones, because they're short (though I doubt anyone ever DOESN'T skip the ones that go for fifteen minutes!). They're paying for my free anime fix, so it's all cool.
What I do object to is when every. single. ad. played during thirteen episodes (two days worth of watching Log Horizon) is the same one
. Seven or eight ad slots per episode. Two ads at a time. All unskippable. ALL THE SAME AD.
I can now confidently state that I have no desire whatsoever to watch the latest Jack Ryan movie.