Polar Signals founder and one of the creators of Parca here. From what I can tell ContainIQ is distinct from Parca and Polar Signals as we only concern ourselves with continuous profiling, which is complementary to metrics, logs and traces. From our experience, while eBPF is certainly limited and it can be painful to work with the verifier at times, it hits a sweet spot for observability collection because of low overhead and you really only read some structs from memory somewhere for which the limitations of eBPF tend to be plentiful.
Definitely excited to see more eBPF tooling appear in the observability space.