[schleck8]

I see third party antivirus all the time. Specifically I've seen Setinel One and Sophos in enterprise applications like hospitals. I'm pretty sure the enterprise version of Defender costs money so you might as well use an alternative that better fits your admins' needs etc.

[nitwit005]

Sometimes I suspect they know it's a placebo, but don't care. Hospital admin fears ransomware, so all machines naturally need anti-virus. They go home feeling better.