Idk. The internet is a tool, I guess? I use forums to get my computer problems solved. Help other people with their woes... I talk to random strangers and learn something about their perspective on the world. Or what it's like in a remote place... Talk about relationship issues. In the old days I'd use them to coordinate activities, projects. Sell used stuff or buy old hardware...
I mean you're probably right, With social media, a lot of places lost meaning and it's more memes and random noise. But I'd argue that's not what the internet is about. Specifically internet forums.
But we're all free to use them however we like. I'm not the Grinch, having fun is a perfectly valid thing to do, and should be part of the equation 😉
Ultimately I like to think I'm not just confined to armchair activism. I'll mix online activities, real-world activism. I'll do projects. Our hacker groups helped avoid Chatcontrol and their online actividies have an impact on people's lives... Stallman changed the world... It's a thing people can do if they like.