Soda lime glass isn't hard to get, it's the "default" glass used around the world for everything from drinking glasses to window panes. If you buy a can of sauce or bottle of wine, that's almost certainly soda lime glass.
In Europe, Pyrex still uses borosilicate glass because it's better and because Europeans are more discerning consumers than Americans. That's my theory anyway. American pyrex cheaped out by switching to soda lime glass.
That doesn't seem to contradict me; maybe they closed the soda-lime glass pyrex plant because those product models weren't selling as well?
Europe makes huge quantities of soda lime glass for a myriad of other applications, soda lime glass simply isn't hard to get in Europe. Wine bottles to windows, all that stuff is soda lime glass; borosilicate glass is a specialized glass that isn't used for most things besides cookware, labware, and sometimes lenses.
In Europe, Pyrex still uses borosilicate glass because it's better and because Europeans are more discerning consumers than Americans. That's my theory anyway. American pyrex cheaped out by switching to soda lime glass.