Joe Ricketts, TD Ameritrade founder, billionaire, and father of Chicago Cubs chairman Tom Ricketts, shut down the local news network of DNAinfo and Gothamist sites today, a week after the writers voted to unionize. Anyone attempting to reach one of the sites was redirected to this letter: November 2, 2017 Dear DNAinfo and Gothamist Readers: Today, I’ve made the difficult decision to discontinue publishing DNAinfo and Gothamist. Reaching this decision wasn’t easy, and it wasn’t one I made lightly. I started DNAinfo in 2009 at a time when few people were investing in media companies. But I believed an opportunity existed to build a successful company that would report unbiased neighborhood news and information. These were stories that weren’t getting told, and because I believe…