Spending tiny amounts using Bitcoin's Lightning Network for digital (SaaS) services is something I'm exploring. It's an interesting application when you need an international payment system for settling cross-border payments. (I'm not a fintech expert, but like I said, I'm exploring the possibilities...) When something costs only a few cents (sats in Bitcoin-speak), the variability of the full price of one Bitcoin is minimal. And when something is a few cents, the transaction fees using any other method makes the whole idea hard to imagine.

tl;dr: international payments for digital goods using the Lightning Network is (arguably) a valid use for Bitcoin that is not speculation.