Sites using public-key-pins-report-only:
6,468 protonmail.ch
10,368 protonmail.com
18,391 ddos-guard.net
114,289 protonvpn.ch
121,165 salzburgerfestspiele.at
191,528 trexcloud.com
201,178 hackthissite.org
217,540 proton.ch
325,403 pm.me
735,495 intellicureehr.com
921,735 twfeg.org