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Easy: can't backdoor a fax based system.

Fax is in fact still used a lot in Germany and Austria because it has some special legal status that EDI and other digital order entry methods don't have.

It's a real PITA having to do OCR on a crappy low res document without grayscales and if course every customer uses their own layout. Things like "13" being interpreted as "B" are super common.

Communications from old tech are much more legally protected than new ones. Fax is still used a lot in the US too for a variety of industries.

Yeah I know, I it's just think it's a bit stupid because a fax has no digital signature, is unencrypted and it's easy to fake because of the low resolution. It should have less protection than modern secure alternatives.

A real signature on paper can be analysed for style, pressure, ink etc but a fax is just a really low quality scan with only 1 bit of colour depth. Anyone with MS Paint can fake it.

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