There are tons of old printers/copy machines that allow SMB access or AD auth that will never see a software update that will break.

Honestly I blame the copy machine manufactures for requiring service contracts for security updates on a lot of this.

Those stupid MFD machines have been the bane of my existence as a sysadmin ever since I started in this career many, many years ago.

It's these machines, plus a few really old windows-only apps deep in basement of enterprises that keep this old tech around. There's usually no budget to remedy, and no appetite to either from leadership

Its also what happens when the people buying the tech are disconnected from the ones implementing. Microsoft caters to this.

Just photocopy some currency. Depending on the machine, it has a good chance of bricking the machine with an obscure error code until a service tech comes out, at which point you can point out this machine is really old and why don't we get a new one.

If you'd rather not commit attempted forgery, just print out some Wikipedia pages about the EURion constellation, which is what they detect in money.

Joking, obviously.