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I think people sometimes use these on purpose when the acronym is its own word. Pin is a word. You should be able to figure out by context that "enter your pin" doesn't mean stick a small sharp object into the machine but "enter your pin number" makes it immediately clear.
No idea why people say ATM machine.
No idea why people say ATM machine.
Best guess, and expanding on your "pin" example, is most people don't know/care what the acronyms stand for and just use them as words. "ATM" then becomes an adjective to describe the machine they're using.
I know this is an odd take but I believe we just see the word ATM as a word instead of an acronym. We see ATM as an adjective now, like Sewing Machine or Answering Machine. That box in the wall is the machine that does the ATMing.
TLA and FLA acronyms
You might RIP in peace for this post.
Smh my head
You need to get over it as asap as possible