And a big reason for this is that we can ship sites without a dedicated backend—which we would need to render your sites for you when you disable JS. A requirement for a backends just to render templates would be a very high obstacle for many applications and developers, in complexity, time, cost, and electricity. It simply wouldn’t make sense.
You’re also right that many devs will host their client-side-only sites on free static providers like GitHub Pages which are built on top of CDNs and cloud storage providers that are storing and mining visitor logs. There’s some room for shenanigans. There’s also a lot of room for privacy: I can guarantee visitors to my static site that nobody will see the data they enter into it because no packet ever leaves. And static sites offer the ultimate immunity to vendor lock-in: literally anything can serve dead bytes on disk.
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