Piln was a prepaid IPFS pinning service you could use anonymously and instantaneously with the Bitcoin payments over the Lightning Network.
Similar to https://eternum.io/, but anonymous, loginless and very very cheap. The cheapness wouldn't scale because it needed a local HD to store data, couldn't work with services like S3 because IPFS is very bad (I actually tried to make it work).
Discontinued because IPFS is terrible.