traffic is not a big issue since we have pre-aggregation client-side. So you can aggregate 5 event / hour or 10 millions it's all the same for DaTtSs... and it does not kill your network stack
As far as retention is concerned let say we aim for 1 month history. Might be more if people say they want it but we believe the value is in the analysis of what is happening now.
Still a lot of discovery to do before we get a clear pricing. Not a priority RIGHT NOW, will become one rapidly.
We're free because we're in beta. Won't stay free. It's a promess. We may open source the whole thing though. Not contradictory at all.
Glad you liked the demo! :)