The point isn't that people like or dislike - it's that the fact a system someone in the industry tells you isn't worth even trying to compete with might be replaced a handful of years later.
The post author didn't claim that no one else would make money or attract customers in metrics-backed tools after Datadog and Prometheus -- but that they were the last and best. The "at that" in "You can’t catch up to them or beat them at that" seems pretty clearly about "best", i.e. quality of the solution.
I claim that the in the intervening decade, dating apps have changed but not gotten better which suggests to me that the Plenty of Fish person may have been right, and this example is not convincingly making the point that flockonus wants to make.
The point isn't that people like or dislike - it's that the fact a system someone in the industry tells you isn't worth even trying to compete with might be replaced a handful of years later.