"On account of what?"

Translation: Kwa maana ya nini?

[WynneBeers]

Why not "kwa ajili ya"?

[BwanaSimba]

kwa maana ya, kwa ajili ya, kwa sababu ya, ni mamoja tu.

[TessEwing1]

I have the ssame question: what is wrong with "kwa ajili ya"?