Being behind CGNAT has downsides yes, for example being unable to ever host anything; you become relegated to a consumer who's dependent on the big hosting companies to ever have an Internet presence. But geolocation? I don't want everyone to be able to get my location! Breaking IP-based geolocation is a benefit of CGNAT, not a drawback.
It's a huge PITA though. I'm near Sacramento but my IP looks like it's in Los Angeles. It screws up a surprising number of things, particularly local TV streaming services.
IP geolocation is a bad idea for lots of reasons. Unfortunately it's also a reality of how services work.
