The OP definitely has credentials in open source but is also a co-founder of coroot. Like I said, he's got both expertise and a vested interest.

That said, the post seems pretty innocuous on a close read: Datadog is expensive, observability is important, there are some OSS competitors trying to offer a complete suite, this is all similar to what happened in databases in the early 2000s.

Hard to argue with any of that.