Sites using public-key-pins-report-only:
3,069 proton.me
6,715 protonmail.ch
8,182 protonmail.com
20,214 ddos-guard.net
90,788 protonvpn.ch
130,995 salzburgerfestspiele.at
333,635 signalpardazgroup.com
359,887 pm.me
381,356 proton.ch
519,674 patton.com
541,364 intellicureehr.com
583,447 htscdn.org
822,077 twfeg.org
850,964 hacksite.net