It's a quiet notification - no sounds or buzzing, only visible if you pull down the top bar. It's intended for contextual use, ideally you'd pair it with a physical call-to-action.

Google are sensitive about the spam potential, to the point where they proxy beacon URL resolution through their servers.

Most people with any BT devices, wearable or at home (audio, smartwatches etc) don't bother to turn it off. And I agree, this crapware feature (of Android, or what's responsible?) just brings back all those obnoxious banners that cities been removing from the streets recently.

I keep it on at all times so I don't have to enable\disable it each time I enter exit my car.