I also spoke with a colleague (who is very computer savvy ), with a LR6 perpetual license for crying out loud, who got locked out of Lightroom LR6 because his firewall blocked Adobe(?) from checking for ..., updates?
I experienced a similar phenomenon. LR 6.0 on perpetual license worked like a charm after installing. Then, due to a problem at my ISP, I had no internet connection whatsoever, and I could not get LR to work for a couple of days. It would start but became unresponsive right off the bat. As soon as the ISP fixed their problem and connectivity was restored, LR was functioning normally again. So yes, even the non-CC version in its default configuration seems to phone home (for updates?), and in a way that functionality is crippled if it can't do so. There has been a short discussion thread regarding this topic here on the LuLa forum.
I don't mind the app 'phoning home' but functionality of the perpetual version must not be affected.
Haven't tested again after upgrading to 6.1. If it's still there, it needs to be fixed.
Christian