The antivirus industry is the biggest player of the modern adware/malware crisis.

The dark patterns used in software like AVG and avast, both making every system I see them on so slow that they might as well be unusable, are all focused on getting more installs, be it to force people into getting whatever "premium" subscription or harvesting data(e.g. attaching themselves to every sent email like a virus).

There are very few that I could actually recommend, like Malwarebytes - for most users, Windows Defender will be more than enough nowadays. I haven't used a mac in a while, do you actually need AV on them today?