{Till some time back|Till few years back" very few bothered if your website was using SSL or not. Infact the term was not known to many and one in thousand knew about the trusted seals offered by security companies. If you had an SSL certificate you were considered to be more info someone who was overly cautious about securing website.
This all changed with a Feb 2018 when Google came out with a update for Google Chrome and on its search engine prefering ranking to websites that were protecting their clients via HTTPS.
Google Chrome and subsequently all the other browsers started tagging websites which were not using SSL as insecure.
How you can ensure that you are not running an insecure website?