Looks great. I think every hypergrowth startup I've worked at has gone through the use commercial tool => tool gets crazy expensive as you scale => "let's just roll our own, how hard can it be?" => "oh crap, this actually is more complex than we thought" cycle.
There are _so many_ types of services that were similarly disrupted by solid open-source implementations due to their price: business intelligence (Metabase), live chat widgets (Chatwoot), monitoring/observability (Grafana). This feature set is even more crucial than the ones above so I'm surprised a default open-source implementation hasn't emerged.
Excited to see how this progresses!