YouTube "Play on tv" button showing up even with VPN on, network map off, and all privacy settings disallowing my location, etc

Description of the issue:

I’m using a VPN to help keep privacy. But when I watch a YouTube video in Brave, the “play on tv” button shows up, and recognizes various Roku devices from my local network. Making me think I’m not being protected at all… Why use a VPN if your local network is going to expose your location anyway? And who is getting this local network info? Google / YouTube? Or just me?

I also have network discovery turned off on my OS, as well as every privacy setting to disallow location, microphone, camera, etc, except when I need them on, for both Brave browser and my Operating System (Win 10).

I read this related thread, but there is no longer any “media router” setting I can turn on / off. Whereas when I watch any video in Firefox, the “play on tv” button is NOT there, which is what I want, but in Brave.

How can this issue be reproduced?

  1. Go to any youtube video in Brave.
  2. At the bottom right of the video window, a “play on tv” button shows up.
  3. This problem does not happen in Firefox.

Expected result:

For there to be NO “play on tv” button. I’m pretty sure it’s just Brave browser, but for anyone who has any hacking knowledge, to me this looks like a built in nmap, which really pisses me off, especially considering I have network discovery turned off on my OS.

Brave Version( check About Brave):

Version 1.29.77 Chromium: 93.0.4577.63 (Official Build) (64-bit)

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