I get what you're saying, it's nice that they're doing this, but it's not really so much a goodness of the heart thing as it is that there is a super critical bug to many versions of Windows and there happen to be enough XP machines around that they're a significant threat. The bugs are big enough and the threat great enough that there's probably less cost in patching than there is in dealing with any of the potential fallout.
I would gladly give them credit by name, if I could just remember who they are...
Dunno for sure because I'm not familiar with their practices here. But it's a thing.
Nobody is maintaining Linux 2.4, which was released in 2001. Its support only lasted until in 2010 as far as I can tell.
On the other hand, many oss projects have rolling releases, so trying to compare like this is futile, expect for the fact they have been maintained for a very long time.
LaTeX 2e has been around since 1994 and is still the current, maintained version.