dpc said:
I'm getting MacKeeper popups again! Every few minutes my screen explodes with a request to download their software. Occasionally it will come up flashing that my system is virus infected and is about to explode and I need to download their software. ! I've run both virus and malware scans and nothing comes up. As far as I can tell, this seems to be a problem I encounter only on this site. Just a note. I don't know what to do about it. This is unethical practice in my view.
While it is indeed unethical, it is due to something you installed, not the CR website.
There are lots of articles about the issue online, if you cannot find it, you may need to reinstall your OS from scratch and be careful about what you install. Even if you uninstall the original software, the bad stuff may be left behind.
Malware bytes removes some but not all of the bad actors, if you've tried it to no avail, try something stronger intended specifically for the issue.
https://www.technobezz.com/fix-annoying-mackeeper-tabs-and-popup-ads-on-safari-mac/