I haven't attempted to control Sonos from a half baked driver in years but wasn't this only a matter of time?  Were any of these drivers from EV and others ever officially supported by Sonos?  I ask because I don't know.  You guys are putting "sanctioned" and "endorsed" in quotes...... What does this mean?

If Sonos said they supported them and then changed you have a right to be pissed but If they were not and you're designing your systems with control drivers that you know could lose integration in the future I think the fault lies with your design and not with Sonos.