I would say it's pretty clear cut that this is abuse in a different way than ext4 because the blockchain has a format for how it stores various fields and you store data by putting different data in those fields. For example the fake addresses to which they send bitcoin to generate transactions.

It's also worth thinking about how this is used in the context of leaking data. Imagine if instead of posting Jennifer Lawrence's nudes on reddit, hackers had put them on the blockchain and just told people it was there. You now have an immutable copy of those photos stuck in a billion dollar speculative asset.