Really there is no precise definition of the whale on the #hive.

This statement is totally wrong
Hive whale is the one who holds at least 1000 MVests. It was described in taskmasters's post half a year ago, here
As of today, on HIVE whale's minimum is 519888 Hive. Other levels:

With the same proportions, on POB the equivalent level today would be 597 POB's , or the same 0.1312% from the total POB circulating supply
With the current inflation, it will double (to 1200 POB) in the next two month, and triple in four month (1760 POB's)
One year from now, POB whale will need to own 4045 POB tokens, and minimum ~8000 by May 1, 2023
It just shows HOW EARLY we all are in the POB space.