It's no different from not having curb cuts on your sidewalk. Culturally tech companies have gotten away with selling non-compliant products and websites, and feel like it's unacceptable to be required to follow regulations because everyone has level-set their expectations around not doing that.
A competent regulatory scheme would have had the government enforcing this from the beginning, instead of depending on private action that seldom happens, but here we are. Uber ignores taxi regulations, AirBnB ignores zoning regulations, and everyone ignores accessibility regulations.