Ec2 squid proxy

Hi, I found an auto-refreshed proxy list on github. Unfortunately most of the proxies there only work with http protocol, not depending on the protocol of the proxies themselves. And the weirdest thing is that these proxies (that only work on http) are configured and raised with squid proxy on amazon ec2 servers. What is their purpose, they are absolutely identical, about 100 proxies that are raised via squid and do not work on https. Can you guess what their purpose might be? I'm really curious. It's just that 99% of web resources have already switched to https, it's very strange