For me, the easiest solution to combat spam bots from registering is just to use a question in the registration that the bot needs to get correct in order to register.
Simple example, "what is the colour of milk?". I ask a slightly harder question, but it has been 100% effective so far, so no need for image verification or anything else!
Good enough that I do not need any kind of human verification or questions and answers for anything in relation to registered members, only for those attempting to register.
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