Consequences: browser warns when visiting the website if it has never been visited before, losing first-time visitors
Demonstration:
https://www.browserling.com/browse/win/7/chrome/92/https%3A%2F%2Fwww.openrouteservice.org%2F
Details:
https://decoder.link/sslchecker/www.openrouteservice.org/443
https://www.ssllabs.com/ssltest/analyze.html?d=www.openrouteservice.org&latest
Just noticed on an occasional visit.