How long will Webroot Support these outdated OS's?

At the bottom of the page: https://www.webroot.com/us/en/home/products/av also Browser support?

System requirements

PC & Mac Requirements

Microsoft Windows XP 32- and 64-bit SP2, SP3 

Windows Vista 32-bit (all Editions), Windows Vista SP1, SP2 32- and 64-bit (all Editions)

Windows 7 32- and 64-bit (all Editions), Windows 7 SP1 32- and 64-bit (all Editions)

Windows 8 32- and 64-bit

Windows 8.1 32- and 64-bit

Windows 10 32- and 64-bit

Mac OS X 10.7 (Lion)

Mac OS X 10.8 (Mountain Lion)

OS X 10.9 (Mavericks)

OS X 10.10 (Yosemite)

OS X 10.11 (El Capitan)

macOS 10.12 (Sierra)

macOS 10.13 (High Sierra)

macOS 10.14 (Mojave)

macOS 10.15 (Catalina)

Minimum Requirements

Intel Pentium/Celeron family, or AMDK6/Athlon/Duron family, or other compatible processor

128 MB RAM (minimum)

10 MB Hard Disk Space

Internet access

Google Chrome 11 and newer

Internet Explorer version 11 and newer (Windows XP IE8)

Microsoft Edge (partial support) When will we have full support?

Mozilla Firefox version 3.6 and newer

Safari 5 and newer

Opera 11 and newer

My understanding every macOS from El Capitan and earlier do not receive Security or Software updates. 

Not everyone in this world has a bottomless purse (and it’s not just the computers that have to be purchased, it’s also often the peripherals, and even apps, due to compatibility issues—ask @NicCrockett!). In my case, two of my three computers are using these old OSs: one Windows XP 32-bit and the other Windows 7 64-bit.

As I understand it, Webroot collect enough statistics from their customers to know what OSs they are using. Evidently, a sufficient number of their customers (such as myself, such as @NicCrockett’s company) continue to use these OSs for them to deem it worth their while continuing support for us.