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Are Mastodon polls a native feature of ActivityPub or are they specific to Mastodon?

Which is what OP is inquiring about, redirecting external links through intent (clicking link in a web browser and having them open in Jerboa).

IIRC the Android OS requires the app to define which URL handlers it should be able to intercepts at compile time as a security measure so that an app can’t decide to intercepts URL it shouldn’t after being installed without your knowledge or consent.

The nature of the Fediverse makes it difficult to achieve that without hardcoding and maintaining a list of instances URLs in the app.

It’s definitely better in third-party reddit apps though.