The bot will only leave one comment for each person even if they keep on getting it wrong
Maybe you should still inform a user again of the same mistake after a certain period of time (such as 72 hours) to avoid people forgetting about using the correct tags again while still minimizing blockchain "spam".
I could, but if they are not bothering to read comments then it may not be worth it. The bot was really just an experiment and if it is actually useful then that is a bonus.
Maybe the user just happened not to read the comments on their posts for a particular hour/day/week.
Even if your bot is just an experiment, I hope that my feedback here still helps.