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How would this be enforceable, though? Part of the benefit of the Fediverse is that multiple different apps can communicate with each other (for example, you can see Lemmy posts on Mastodon). Even if Lemmy implements something like this, what’s to stop someone from commenting using a different app that doesn’t implement it?
I’m actually surprised we don’t see more spam on ActivityPub-powered systems, since spammers don’t even need to have an account with Lemmy, Mastodon, etc and could instead have their own ActivityPub server to send the spam. I guess they don’t do that since the spam instance would be defederated pretty quickly.
So far, nobody has proven that any major phone apps are constantly listening and sending that data somewhere. That would be huge news if it ever happened.
For voice assistants, they’re tuned to listen specifically for wake words like “hey Siri”.