I don't find this guy's experience as an indictment of that model, however. And certainly equating spam complaints from follow-on emails isn't an issue with the freemium model, unless you believe the value of your service is enhanced by unsolicited email.
But hey, this guy got something valuable out of this, but not in how he's stated it. He blames the users, but I blame email. Take email out of the equation, and I bet his subscriber take rate increases.