The actual reason states that they
We see no need to add speculative suggestions to the actual reason that has been articulated by their official representative.
Most KVS Tool Users also have ....... (or similar extension) installed in their regular web browsers, so they would not see advertisements regardless of which browser they are using.
Indeed.
I feel dirty even using this as a reference (
http://viewfromthewing.boardingarea....n-use-instead/) but a third party "well established blogger" says otherwise:
"So they decided it was too costly for them to support given its use, at least that’s their explanation."