Sounds suspiciously like they want to avoid having people slam their APIs unnecessarily. They probably don't care how you use their APIs, they just don't want you constantly polling them and/or sending of query bursts just to get some latency stats. Every API hit adds to the load on their servers, and it may also mess up their own internal API statistic gathering.

So they probably want some pre-established legalese that allows them to kick people off who make an unreasonable number of queries for no practical reason.

One developer doing this probably isn't a concern to them, but if thousands of people all over the place do it, that could become annoying.