They have become what their idealistic shareware founders abhorred: greedy, tricky, bloated, complacent corporations preying upon people’s FUD - Fear, Uncertainty, and Doubt. The elder companies seem to have lost their way, frankly. Avast and Norton emerged in 1991, while AVG appeared in 1993 and Bitdefender in 2001.
To proactively protect your PC against these types of threats, consider subscribing to Malwarebytes Premium to ensure that your PC is protected regularly.MalwareBytes, founded in 2008, is by far the youngest of the security software companies I have reviewed so far. To check for a virus or malware on your PC, you can use Malwarebytes' free antivirus to scan and remove threats.
Windows 10 PCs face threats like ransomware, in which your computer's contents are encrypted and you can't access them without paying a ransom (usually in cryptocurrency), zero-day attacks which are exploits of brand new vulnerabilities before the software developer knows about it or has a chance to fix it, and other advanced forms of malware that are much more sophisticated than your traditional computer virus (although those remain a threat as well). Microsoft issues 83 patches, one for actively exploited vulnerability.