The Steemcleaners and other bots are all community projects. They don't have any official backing. Just community support. They also are fallible and can make errors, just worth noting, as I've had a post incorrectly flagged for tag spam although the tags were (clearly) appropriate, and it was later retracted from the report.

There aren't really community guidelines, it's more like there are a lot of sub-communities and they each have their own sort of "culture", if you will. You kind of have to walk on egg-shells until you know who's house you are in, then you can act more appropriately.

By "who's house you are in", I mean if you act the wrong way in the wrong sub-community, you are likely to get flagged out and be unable to earn rewards. The smaller you are, the more generating a backlash against yourself can really hurt your potential earnings or reputation. Part of this is because the official line on voting (up or down/flags) is that there is no official line - each user can use their vested share as they see fit.

Also, my personal rule I try to follow was also stated below by @realitycheck:

Positivity will earn you many more friends here. If you can't post something positive in a post, and it's not abuse (spam/plagiarism etc.) you should probably just move on to another post, not vent in the comments, unless you are willing to be diplomatic and open to new ideas.