Right. The platform I was thinking about was mobile, so bots may be prevented there? Also the human bots would probably be bottlenecked by the fact that there would need to be askers asking the questions. Essentially, I am thinking of charging 8 cents to the askers per person.
I think you will find more then enough people willing to answer questions. Not necessarily hn readers though...
Your bottleneck will be the question askers, people who want to ask (random) people questions. You would at least need to have some audience selection, e.g. only ask this question to asian females aged 28-48 interested in crocheting. That way the question askers maybe get some value out of it.