What's the most reliable way to determine the user's country setting?

[inviz.]

I'm developing a browser extension for YouTube Music, and let's just say that it has something to do with the content that the user sees. But while YouTube itself filters the content that user can or can not see based on content region restriction, I have to filter it myself so that my extension doesn't use what the user can not see. But as of right now, Google offers no reliable way to request info concerning the user's location, so I have to just send requests to ipinfo.io for that purpose.

P.S. my extension doesn't collect or store any info about the user and doesn't sell it to anyone