Why would you want another year of their software for free?
Because AV, like everything else, costs a fortune at enterprise scale.
And yeah, I do understand your real point, but it's really hard to choose good software. Every purchasing decision is a gamble and pretty much every time you choose something it'll go bad sooner or later. (We didn't imagine Vmware would turn into an extortion racket, for example. And we were only saying a few months ago how good value and reliable PRTG was, and they've just quadrupled their costs)
It doesn't matter how much due diligence and testing you put into software, it's really hard to choose good stuff. Crowdstrike was the choice a year ago (the Linux thing was more recent than that), and its detection methods remain world class. Do we trust it? Hell no, but if we change to something else, there are risks and costs to that too.