I think without moderators or the Follow/Follower relationship you're going to run into a lot of junk. Tags just don't really cut it in that regard. I kind of wish it was like Stack Overflow where you gain reputation points which eventually allows you the ability to post, edit, comment, etc. You could even go so far as to limit the amount of posts people are allowed per week or something. There's a lot of options but keeping things open to all levels and interests is always going to be a difficult challenge.
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I've seen a few posts describing the same problems you're bringing up.
dev.to/codemouse92/social-lifespan...
dev.to/moopet/how-should-we-handle...
I think without moderators or the Follow/Follower relationship you're going to run into a lot of junk. Tags just don't really cut it in that regard. I kind of wish it was like Stack Overflow where you gain reputation points which eventually allows you the ability to post, edit, comment, etc. You could even go so far as to limit the amount of posts people are allowed per week or something. There's a lot of options but keeping things open to all levels and interests is always going to be a difficult challenge.