Referrer data has a lot of non-shady uses and it is really useful. That's why we have GDPR, so we can use referrer data as intended by preventing people from combining data.
Also, I don't think you can equate this with guns.
Try equating it with metal. Yes, you can make it into a gun, but you need to have lot of different things in place before you can use it to do harm.
Referrer data is completely anonymous. If you want to combine it into a profile, you need layers and layers of complexity and other data before you have something you can use it to target users based on their interests. With GDPR, this is illegal without consent anyway so I think you're overreacting.
Also, I don't think you can equate this with guns.
Try equating it with metal. Yes, you can make it into a gun, but you need to have lot of different things in place before you can use it to do harm.
Referrer data is completely anonymous. If you want to combine it into a profile, you need layers and layers of complexity and other data before you have something you can use it to target users based on their interests. With GDPR, this is illegal without consent anyway so I think you're overreacting.