It's a pretty scattered landscape with everyone wanting something slightly different, but everyone has likely heard of Datadog at one point or another (whether they wanted to or not... but that's another story).
It becomes convenient short-hand for what they do (collect logs, metrics, traces, RUM, etc. for engineers to debug).
Though with more characters to write, I'd like to think we have a different take on both how our pricing model works and how easy it should be for an engineer to get started with us :)