I just looked into it because of your post and it's nothing for me since it doesn't use PoW but Proof of Spacetime. This means that you have to allocate harddisk space and when information is stored on your harddisk then you get Filecoins.
Therefore I would say it's not for the typical small miner aka end user but indeed for owners of server farms you mentioned.
Yeah right, base on the Proof of Spacetime, you need hard disk to mine Filecoins and giant companies have way more storage space that can be provided. However, the team behind Filecoin said they would like to design a protocol that data consumers can retrieve data from the nearest node(ideally within 1kilometer), this might lead to a chance for smaller miners get more reward than they expected.