> load about the same size data of a native app without a warning and would report me to facebook, google and others

Why do you think native apps are not like that?

Many apps load SDKs from google and (especially) facebook. They often load a lot of assets from servers.

I can see what is the required download size for install and I can track how much data an app is using on iOS.

For websites, this is not an option.

You can see the installed downloaded binary, sure. And you can see usage after the fact, but there is no reason to assume that the app store size is the only download it will use, most major apps I've seen use a lot more even when not downloading media.

It’s still much better than not having a clue.

So:

Option A: Only runs on one platform, can only be published on that platform with the blessing of the manufacturer of your device and little-to-no insight into data usage

Option B: Cross platform, can be interfaced with using open standards and block parts of it that you want (not just on a DNS level, but on a resource level)

I really don't see why you would prefer A?

You prefer option A because it’s much better experience.

If you’re building a service that’s not suitable for option A then you use option B. It’s not really a discussion at that point.

I’m glad that there’s an option B the way that I am glad that there’s frozen pizza in the fridge. Good to have it but I’m not gunning for it if a proper restaurant pizza is available.