This means that MH370 got either destroyed immediately, which on AF447 was not the case, or MH learned from AF447 incident and keeps the ACARS data for themselfs.
So a conspiracy theory is brewing
If they had the data...Why would they not just send the search party to its last known position?
Maybe because it was shot down by the Americans and they have told the Malaysian Govt they have to come and cover up their actions?
We've had alien theories...why not this one