I used to make decent amount (for my purposes) around $1000 a month. This was when the ads were based on the content. Then a few years ago they based ads on the user (as personalisation is all the rage) which for me was ridiculous as my site was about general social, political and environmental issues, so you'd end up seeing an add about shoes or something you were shopping for on another site which was completely unrelated to why people came to my site and completely out of context so the ad clicks and revenue dropped while site usage was growing. No way to reach a human to change it back. Some option on AdSense implies you can but has not worked.

Also at some point got banned for false clicks except the site they said that was violating their policy was not mine. Their automated responses of course did not help. Only a few months later a friend of a friend who luckily worked on the team was able to reinstate the account (but not the list revenue in the meanwhile if course). turns out they had a big they didn't admit false flagging my site. Wonder how many others they caught out...

Have ended up sticking with them as don't have time to look for alternatives (tried Chiquita but not very good). (The site is a side project only.) Would like to build my own niche for maybe non profits only, though I'm sure someone has done that already so I probably need to just invest some more time to look into it more...