It's built on Bitcoin core and IPFS and MongoDB. I think Bitcoin is mainly used as a timestamping mechanism, but there you go... the BTC chain being used to store data by one of the largest tech companies in the world.
Data != Files
I mean, technically the distinction between a file and data (and anything digital really) is rather arbitrary ¯\_(ツ)_/¯
But yeah, storing small amounts of data / small files is not the same as storing documents or even media files. I do think Bitcoin and IPFS can complement each other rather well though and using one to verify the data of the other is IMO as close as it gets to what I assume OP had in mind. Whether that's something that should be turned into a BIP is a different question of course.