I can see this being very attractive for side projects / early stage bootstrap stuff where you may not be able to afford something like datadog.
On the flip side, there is something to be said about someone else hosting your monitoring systems, as hopefully if you have a massive outage the third party system will still be up.
I'd imagine that you could achieve this here by starting off self hosted and then migrating to their cloud offering once your systems were critical enough to justify it.
You're right that this is a pretty crowded space though - look forward to seeing how they do
I think we've done pretty good job with filtering+grouping+aggregation and data exploration in general. That is something I am proud of.
Uptrace is significantly cheaper.
As for the rest, it is the same but different. DD is bigger and more complex. I guess that is not the problem when you get used to the UI.
Any mobile client sdk? Android/iOS you are aware of?
We tried other hosted services but most if not all of them consider you are creating gold from thin air and charge you accordingly, we started with a hosted jaeger solution and switched to uptrace without looking back.