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Answering myself: nope: <https://www.pulumi.com/docs/intro/concepts/inputs-outputs/#apply>: "you should not allocate new resources inside of your callbacks either, as it could lead to `pulumi preview` being wrong"

In this case, what is the proper way of instantiating a resource per each of zones returned by <https://www.pulumi.com/docs/reference/pkg/aws/getavailabilityzones/> ?

perhaps it's OK to do it inside `.then` on a promise, but not inside `.apply` on an output?

while we try and recommend not doing this, it's sometimes unavoidable, this seems like one of those cases

if you're okay with the preview being wrong, you can go with this

thanks. It's an option, but OTOH we consider reliable previews necessary