Agree 100% with every word you wrote.

    eventually all not heavily moderated communities 
    will suffer their version of Eternal September.

4chan really is the ultimate example of what happens to unmoderated free speech zones. It really was better, once upon a time.

Unfortunately, it's hard to cite 4chan as an example when talking about the merits of unrestricted free speech vs. moderation/curation since most people think it was always that bad.