Of course they could, this is a software limitation. However consumer friendliness is not in either companies interests. Apple prefers to keep total control over their ecosystems so they aren’t going to do Google any favours, and Google likely doesn’t care much either way seeing how long it’s taken them to even attempt a similar network.
Kind of. From what I’ve heard each network will alert you if it always sees the same tracker from the other network, as a precaution against unwanted tracking / stalking. I don’t believe it goes further than that though, as in the networks won’t report back all the tags they see on a daily basis to help with location.
Man made one of the pioneering smartwatches before anyone else. My pebble still had better battery life than my current feature bloated smart watch. He knows what he’s talking about.