They don't it all depends on the relays you are connected to. Relays are like websites with their own tos & pp. A relay owner will censor & filter out anything they don't like. There are relays full of spambots & trolls but you may not see them because the relay you are using is censoring them. Add more relays to your profile & you will see more things.
Discussion
ahh ty
You're welcome any other questions I will do my best to answer them.
so I searched and found an overwhelming number of relays https://legacy.nostr.watch/relays/find so I’m wondering if some brilliant soul has compiled a list which describes each relay or gives some clue to its content or rules, a ranking or categorization of relays I guess is what I’m looking for
I use to use this website before the owners stopped keeping it up to date. So I haven't found another site yet that does. I would be interested because a few relays I added from there are just copying posts from other relays I had some peoples post showing up 3 times from 3 different relays. So i had to shut those off.
very well, I’ll just begin experimenting and add some and see what happens