This lead to even more strict echo chambers because they effectively kill different opinions. The bubble will become even more strict and radical to people that are not living the cult.

True, but in cultural matters I wish we had more ivory towers and (yikes!) elitist closed communities than watered down open spaces that average out to mediocrity. See niche subreddits when they go popular and devolve into dumb memes and a neverending stream of the same beginner questions.

All the public internet has brought is homogeneization rather than specialization.

while true i think it's inevitable. bots are most of the internet, limiting communities to known good actors is becoming incredibly important and the side effect of removing unknown good actors is difficult to get around