I was a phpbb2 free forums provider back in 2006.
Had a million visitors per month.
But spam was a big problem and monetizing barely paid the server cost, which cost 120 eur per month. 1 server had about 2500 instances and load was always >1.0 .
All my time went into maintaining the site.
After a while I had the option either continue to waste my time with this or just close it down.
I opted to close it and sell backups of the database for 25€ each.
I got some hate, to which I responded with hate myself, ungrateful bunch!
Some communities however managed to get started on my platform and migrated to hosting their own.
I remember one community in particular, which was a goose farmer community from Finland.
I helped them migrate to their own host and the member made a thank you thread, which was so heart warming :).
And then there was a writers community from Poland.
All in all it was very interesting to see all the different kinds of nieches and interests people were into.
There was a FKK aka nudist forum, and I would get adsense warnings on a regular basis. So I exempt them from adsense ads but put some adultfriendfinder ads there.
Anyhow I've been writing a modern, real-time multi forum system for the last 4 years on and off, but idk if it's ever going to be ready.
Forum software may not look it, but it actually quite complicated.
Forums went away and got replaced by the horrible reddit, which Google pushes in their results. Every damn exotic search has a reddit result in the top 3 results.
Facebook added to that, forums were the main info banks, then Facebook came and not only mostly destroyed forums but also classic, colorful websites.
I hate to talk like that but what once was a wild, arguably pretty and free internet, Facebook turned into a white-blue dystopia. A walled garden where censorship was and is the norm, where you're identified and tracked, where you habe zero choice about the look of your profile/wall. Is it even called a wall anymore?
And what's worse Instagram is replacing Facebook. Communication by images only. How dumb is that?
Yes we need text culture back.
But nowadays if I would be super smart and have the resources, I'd probably build a speech recognizing feature, where you can just record paragraphs because people don't like typing. With the option to also post that recorded passages of speech and read that text aloud.
Which brings me to Adsense has this new experimental feature, reading content out aloud and monetizing that.
1+1=2?
That would actually make forums have a comeback. Because now you actually CAN monetize single posts.
P.s. those ~2500 instances were hosted on a single core amd64 with 2GB of RAM and RAID1 only.