The bots already know how to work with the audio change that they go little by little change the audio put something better
I don't know if it's really the bots are to be blamed, but I know there are sites that pays bitcoin/satoshis directly to a certain microwallet to people solving XRB captchas/audio captchas and they still exists today. Some people actually choose to use them because they pay bitcoin directly but at a lower rate.
i one of those who started at a pool but after they change to audio i search and found that its better doing solo mining. the rise in TH as i see it not because of bot just like me i hate that fucking audio but human can adapt. its so frustrating from the beginning my mistake is much more that correct im always at the red flag but after a day or two even the lowest sound of a number hidden in that fucking background you can identify it.