There is a useful signal in such a way of indicating pricing: it signals that the billing is done at such a resolution, which, for some workloads, can make a difference compared to say, a minimum increment of an hour or a day. Though I would prefer that you can see the conversion to longer timescales on the page itself.

I thought about that, which is indeed what AWS Lambda does, but one of the pitches here is "Always-on VMs," which is not what Lambda is selling.