For free integrate back into stack overflow. there are tons of questions that never get answered. This also provides a public forum for that response to be corrected and provided feedback. symbiosis.
Also theres a chance these LLMs have access to other tech forums in addition to stack overflow and could possibly provide a solution. For example GitHub has actually been the better source for me when debugging issues. Usually you can go to the repo and search the issues and read comments with solutions or workarounds.
But aside from that i am in agreeance with you that these bots will struggle to provide new, non regurgitated answers and could potentially cause more harm than good