Sites using public-key-pins-report-only:
2,956 proton.me
7,137 protonmail.ch
10,697 protonmail.com
17,996 ddos-guard.net
115,113 salzburgerfestspiele.at
135,361 protonvpn.ch
158,344 proton.ch
164,183 trexcloud.com
174,674 hackthissite.org
321,709 pm.me
443,730 patton.com
535,401 signalpardazgroup.com
655,227 hackdb.net
790,729 intellicureehr.com
837,896 twfeg.org
994,899 sailing.cz