Scientists have produced an oxide glass with unprecedented toughness. Under high pressures and temperatures, they succeeded in paracrystallizing an aluminosilicate glass: The resulting crystal-like structures cause the glass to withstand very high stresses and are retained under ambient conditions.
I don’t think the glass makers themselves are necessarily the issue - they’ll supply whatever is in demand, including low quality crap if demand is high enough.
People know brand names. People don’t own glass testing equipment. People will buy cheap glass for a high price if it has a brand name they associate with quality.
Supply and demand has nothing to do with it.
The existence of quality makers implies there is sufficient demand for quality