I think soon or later we will need some kind of public institution that will do this sort of scans; all those unsecured IoT printers, vacuum cleaners, fridges, abandoned servers, Synology servers, etc. would become a real threat at some point and the costs of dealing with issues caused by them like identity theft, false accusations because on someone's server there is child porn uploaded by a cracker, bot nets will b…
In the US, DHS does this for the federal government, as well as some state and private organizations: https://www.us-cert.gov/resources/ncats