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I've tried to do a little reading up on Saas, Paas and Iaas and tried to understand this a bit betterTo distill this down for the purpose of this specific topic (map tiles):
- the map tiles being provided under CC is a copyright / right-of-use / legal intellectual property thing. Nothing to do with any provision of material service by Stamen
What Stamen provide that's relevant here is a service, that's somewhere vaguely in between SaaS and PaaS.
- SaaS would be if Stamen provided some kind of maps website, with accounts, etc. for working with data & displaying maps. They don't really do that fully.
- PaaS is a bit closer to what Stamen do: they run a server and host their own map tiles. You can point your website at their server, and they pay the hosting cost of the traffic you send there. (PaaS as a buzzword technically involves a bit more than this, but this would be a subset of it).
- IaaS is an unrelated thing here: this would be like if they offered servers for you to go and host your own map tiles on, along with a load of tools for managing those servers.
TL;DR: The CC-licencing of tiles is about releasing "artwork"/IP? (is there a better term for map styles??) that they've already created. Tile-hosting is about paying for internet traffic of the browsers hitting the server where those tiles live.