I'm using AntiBot Captcha plugin with the latest q2a version.
it is working very well and has almost stopped spam registrations using bots. (I had 1000 to 2000 bots registrations each day!)
Just install it go to plugin settings increase the "Symbol count" to more than 6 and add some letters to "Character Set". (Characters are case sensitive)
Here is the link: https://github.com/pupi1985/q2a-kk-abc
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July 25th, 2023: Q2A 1.8.8 released!