Seriously, this is old news. I've been using Digsby for a few versions now, and knew about this from the beginning. The option to turn it off via the "Support Digsby" dialog has always been there. The very fact of the presence of this "feature" scared me off at first, but the quality of the app won me over in the end.
So no, I'm not a fan of having this be part of Digsby, but at least they disclose it (I'm pretty sure there was a blog post on the Digsby Blog a while back about it, and how to disable it) and allow you to opt out.
"The fundamental principle of science, the definition almost, is this: the sole test of the validity of any idea is experiment." -- Richard P. Feynman