I think Sandy’s right. Aren’t the woobly letter/number codes pictures? So a person would have to do it personally?
Well, not exactly. Yes, it is an image with the numbers/letters, but people make programs specifically for being able to read them. That’s why some are hard for normal people to read, because they have to be so messy to confuse the programs/bots.
I’ve seen some sites where they have a “click here to hear the letters” which is really helpful.