Fraud Protection: Country Blocklist
The Country Blocklist can be used to block impressions, signups, shares and referrals which come from specific countries. Simply enter a comma separated list of ISO 3166-1 alpha-2 codes you wish to block via Settings > Fraud Protection > Country Blocklist in your project dashboard, then Save your changes.
If you notice many fake signups coming from a specific country, for which you do not have an audience, then you can enter it into the Country Blocklist and all future signups from that country will be blocked.