[stubish]

There is no sensible reason, except perhaps money. And using it as an attempt to increase funds or raise the low pay levels hasn't worked and won't work. It is likely to be stuck that way until Chrome stops serving plain HTTP at all from the Internet and someone gets a kick in the bum to fix it, after which a few clicks with Cloudflare or other HTTPS front end provider will sort the problem. And possibly even save money due to caching and not passing on much bad traffic.