The janitor, as the name suggests, cleans the site, to do this he just moved threads around, im not sure if modern janitors are able to delete threads but they cannot ban users.
Anyone can apply for janitor and be removed whitout previous warning.
The requisites are quite basic, having some time on the board, know it's culture, rules, issues and having free time.
As a janitor should not be able to delete threads, just in case of something going wrong, a trash board could be used as means of removing bad threads.
Since this is mlpol and just one man should not have the power to censor content as he likes, a janitor should ask the community before taking action.
While it is true we are slow and feedback takes time, pre existing rules for janitors (like moving glimmer threads to a certain board) could take care of this problem, outside of that, it is pretty obvious that low effort, bait and shitpost threads should keep on /sp/ and not /mlpol/
I hope this is an acceptable suggestion.