I do feel that Grafana are slowly becoming more cloud-first, regardless of that a lot of work is done in OSS. Even if I look at the blog, most content there is about Grafana Cloud. The "Grafana LGTM Stack news" section isn't navigable.
With Opsgenie shutting down, and I see that DataDog releasing their on-call feature; maybe migrating away from the LGTM solution might be a whole thing if there's nothing to replace OnCall; not that it would be easy, mind you.
Standalone tools like Rootly (where I work) but also likely every observability company in the next couple of years will follow what Datadog has done.