Noob question. In the Metadisk whitepaper, it is stated that copies of data will be stored in three separate locations in line with current industry redundancy standards. In the Storj whitepaper, it is stated data will be broken down into byte multiples such as 8 MB or 32 MB. It is also stated that a "farmer must be able to prove cryptographically that it has the shard, and has not modified it in any way." What are the chances of a malicious actor 'damaging' all three shards and destroying the data?

I also noticed that the Storj whitepaper is co-written by Ethereum's Vitalik Buterin. Personal contribution or is Ethereum involved with the project?