I think we fit in that bucket [1] - open source, self-hostable, based on OpenTelemetry and backed by Clickhouse DB (columnar, not time-series).
Clickhouse gives users much greater flexibility in tradeoffs than either a time-series or inverted-index based store could offer (along with S3 support). There's nothing like a system that can balance high performance AND (usable) high cardinality.
Companies like https://signoz.io/ are Opentelemetry native and have very transparent approach to predictable pricing. You can self host easily as well.
What newer tools/companies are in this category? Any that you recommend?