I made a short video that you can watch to understand. Again this isn't BPT specific but something Google implemented regarding tracking (I think it's part of their settlements with the European Union and is being implemented everywhere, NOT just the BPT website, all websites will be required to give folks an option to opt out of tracking cookies

Youtube Video Explanation of GDRP pop up

And here's a further explanation:

People have questions about our GDPR popup that started appearing today. Google has changed policies around adsense requiring any website that uses tracking to allow opt out of tracking cookies. As a result we've had to implement a cookie popup, you should only need to interact with this popup once per year as your settings will be saved on each device you access the website from.

Apologies for any confusion but we didn't really have a choice other than to implement this feature.  

Also, regarding the Silver and Gold options, like it says in the description, silver only allows data sharing for security purposes while platinum allows data sharing for targeted advertisements. Google adsense respects these levels, it also interacts with browsers "do not track" feature if you have that enabled.

Matt