It would be very annoying if everybody were doing that. Notifications at every step. Luckily I keep bluetooth off. How many people keep it on all the time?
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.
