Google’s original (and OpenAI’s) business model was also building a scraping infrastructure, system, and architecture, from scratch — and providing access to something that never existed in the first place.
Public safety communications are radio waves that are broadcasted and the ability to passively monitor them is enshrined in United States law. That is a massively key difference.
If I was sending data into your home from my infrastructure without any action from you whatsoever, and you were reaching up into the air and gathering it and repackaging it, AND the law said that I have no intellectual property rights to said data, then that's a whole different story.
You are trying to draw a distinction between data that is pushed and data that is pulled, and maybe there is some economic argument there in terms of resource usage, but that is very context-dependent.
In UK listening to public radio broadcasts is illegal. I think this law is idiotic and ignore it. It seems you do too since there appear to be streams from UK on your site :)
Please don't mix consensual and non-consensual scraping, the difference is huge.