Sites using public-key-pins-report-only:
3,071 proton.me
6,815 protonmail.ch
9,700 protonmail.com
19,536 ddos-guard.net
99,199 protonvpn.ch
141,342 salzburgerfestspiele.at
155,520 hackthissite.org
351,159 pm.me
384,042 proton.ch
542,678 intellicureehr.com
583,308 htscdn.org
585,238 patton.com
732,982 hacksite.net
855,542 twfeg.org