That's not true in the least - Tumblr has paid layouts and traffic-generators, as well as ads that they get money for you to look at, incorporated through means that, unlike LJ, you can't adblock out. And Tumblr's been around since 2007, and many of the people complaining have been there -- that's longer than I've been on LJ. The newness and hipness of a site does not suddenly negate its customers' right to complain or leave. And on the internet, users = customers. Traffic generates income. "Let's bring our traffic to a site that actually cares about us" is 100% valid, regardless of how many years you've been giving that traffic.