However, it has not been a viable platform (one that people actually used) for many years, so while I am saddened that it is finally being shut down, I'm not surprised. Many thanks to Dalton and everyone who built it and kept it going these many years!
Problem was none of them actually stopped posting on Twitter, at best they just set app.net to mirror their Twitter never really engaging with the network because none of them were willing to give up their high follower counts they had from being early adopters of Twitter.
Too much ego to put up with the BS from twitter, yet also too much ego to give up their high follower counts.