I blame the decline of the #FSF. Users are using OSS because it's free as in free tech support, Devs are making it OSS to increase their userbase for VC.
Ask either group why their software isn't #AGPL3 and they would recoil with horror at the idea, but wouldn't really be able to articulate why not.
Just pressed send and realized I told a lie. If you asked Devs these days most would reply "GPL? What's that?".