Sites using public-key-pins-report-only:
2,884 proton.me
8,109 protonmail.ch
11,834 protonmail.com
78,976 protonvpn.ch
104,984 proton.ch
184,562 trexcloud.com
212,044 hackthissite.org
308,830 pm.me
435,954 patton.com
453,205 protonmail.de
537,963 signalpardazgroup.com
810,474 intellicureehr.com
879,017 twfeg.org
939,579 sailing.cz
995,311 emorahealth.com