When a browser sees a website with areas that you can enter information, it checks to see if the site has a valid SSL certificate. If not, it issues the "not secure" warning. I'm guessing the owner doesn't want to spend the 100$ a year on it.
My Old Monza now lives in Arizona with its newest owner.
The 90's just keep rollin' along........ 1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 118K miles 1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 157k miles