everyone's rewards history was cleared. This is normal. He does it to free up space on the server.
One of the main reasons why I left. This is NOT normal. Imagine eTrade clearing out your trade history... there's no good reason for that. Archiving I can understand. Deleting... no bueno.
And doing so to save space on a server? Simply indicative of a budget operation - WHETHER OR NOT they are mining.
This is +1000. Anyone who thinks its normal that their investment history is routinely wiped out has likely only invested in CryptoPonzis.