Maybe 15 years ago with no Social Media forums were the place to be.
In 2022, what is the deal with forums? Are they dead? Are there many active forums out there still?
Asking because I was planning on picking a niche and doing some forum marketing.
Let's wind that clock back a little further. Prior to forums, of the same vein, were Bulletin Board Systems (BBS), which had message boards. Both BBS and what you are calling Forums fall under "message boards". And message boards are not going anywhere any time soon.
There are definitely distractions, as many people have mentioned, such as twitter, instagram, facebook, and the likes, but these are just different styles of message boards. This is also to say, that internet forums are technically "social media".
So, 15+ years ago the social media landscape was more sparse. (Not that Twitter was a magic bullet, but Twitter kicked off in March 21, 2006.) In that environment, internet forums, such as BHW, and the likes, thrived and had fewer competitors. Technology started taking larger percentages of the target audience, but luckily the target audience was also growing. Now there are various styles/types of message boards, such as BWH, Twitter, Instagram, Discord, and even TikTok. The target audience, or the number of users has grown quite a bit since 2008 (15 years ago ... it is currently 2023).
Something else which has contributed to more potential users and possibly fewer "forum" users happened June 29, 2007, when Apple released the iPhone. This made the internet a bit more mainstream. Putting the internet into essentially every human's hand was a game changer.
OurWorldInData.org says in 2010, the total global number of internet users was 1.992 billion, and in 2016 that number had grown to 3.408 billion. A lot of potential internet forum/message board users.
With the exception of Facebook, and Discord, a lot of the current message board hybrids (Twitter, Instagram, TikTok) are very open with a target audience of everyone. Facebook and Discord, and of course others, allow for smaller communities to be established. This is one of the strengths of internet forums, such as BHW. Internet forums are generally established around a central theme or concept and build a community around that. For example, BHW world has it's niche, and it's respective community. As another person noted, you can search (google) for just about any topic and you will most likely find a corresponding forum. This community strength of forums also adds another advantage/strength, which is that with focused community comes focused knowledge. Of course, the quality of the knowledge is limited by those who compose the community, but generally speaking, when you visit a forum you will find there are "resident" "experts". As has also been mentioned in this thread, questions on twitter will generally yield low quality responses. Consider this thread, had you posted it on twitter.
FWIW, according to archive.org's wayback machine, BHW started in 2006, with the first capture being May 3, 2006. So, 15 years ago, BHW was just a baby forum.
Message Boards, to include internet forums, are not going anywhere any time soon. They may fork here or there, but feel free to start new internet forums and grow new communities.
Now, had your question been about IRC, I would shed a tear with ya... :`(