It can't be that hard to develop a forum 
Yeah. The fact that we currently have dozens of developed forums with a large user base is obvious proof. Today, it is very easy to develop and maintain a forum with 99.9% uptime online, boasting 3.7 million registered accounts.this was sarcastic
Is it worth coming back?
It's not worth back. Better start your own forum, which will be spam-free. At least that's not a big job.