Machines that can be readily tampered with and reprogrammed in undetectable ways likely sell better under the assumption leaders would rather stay in power and have ceremonious democracy than risk being ousted or overthrown.
Regardless, if someone was upstanding and wanted to run a fair election with the machines, they can do that as well. Ones that can be altered, preferably only by the election committee to change an election without getting caught, is likely a highly sought after device.
That's likely why we keep finding them over and over again. Every few months another trivial exploit that a fairly incompetent people could discover is found on yet another device.
No receipts, audits, paper trail or any verification ... just a bunch of readily reprogrammable devices that anyone with a USB stick or an sd card or the edge of a housekey could use to change the votes however they please. Again and again and again.
It's very likely intentional.