Whatever happened to tire scratchers? They worked wonders for cutting down on puncture flats caused by thorns, glass, nails, etc.

I'm thinking that, "an ounce of prevention is worth a pound of cure", could apply here. I don't think it's feasible to 100% eliminate flats but I recall when I went to tire scratchers back in my sew-ups days of the 70's and early 80's that flats were few and far between. Then mysteriously tire scratchers disappeared. Did the tube makers buy-up all of the companies making them? Hahaha....