Ookla test inaccurate
The Ookla test significantly underestimates the capacity of high speed circuits.
The MLAB test provides results that are consistent with test results obtained from reliable independent high-speed test sites. The Ookla test runs for only a very brief period of time, and reports results that are a factor of 20 to 30 too low. (I have a high speed line.)
If clients only run the Ookla test, the data collected from those consumers is probably upper-bounded, and will not accurately record the capability of any high-speed circuits that consumers may have.