Apple moved to IPP (branded as AirPrint) a decade ago. Google shut down Google Cloud Print in 2020 and moved to IPP. Microsoft announced that they were moving

Apple moved to IPP (branded as AirPrint) a decade ago. Google shut down Google Cloud Print in 2020 and moved to IPP. Microsoft announced that they were moving to IPP (branded as Universal Print) in 2020 as well. CUPS still exists because legacy printers don't have built in IPP support.