https://bitcoinstrings.com/ is a great site that compiles all the strings imprinted in the bitcoin blockchain since the genesis block!

For me the idea of backing up all the wisdom of humanity in bitcoins blockchain is a major use case for BTC ((I mean this of course within the context of the current block-size, no need to change anything, all we need is a place to store all the information we can from humanity that is stored in a decentralised manner in gazillions of hard drives all over the world))