Wow, when are you going to realize that you work for your users?
This isn't "one user" being "so demanding". Its a trend. Read what others have said. Learn from your mistakes. Your community of instance admins are pissed because you're constantly throwing them under the bus. And, yes, your moderation tools are crap. Thats objective.
And 2000€ per month is a ton of money. Most open source devs get nothing. Stop being so ungrateful and disrespectful to the community that you work for.