Because of the internet, magical times can never be had again. You can invent something new, but as soon as anyone finds out about it, everyone now finds out about it. The "exclusive club" period is no more.
Yes, they can. But we need to admit to ourselves that people are not equal. Not just in terms of skill but in terms of morality and quality of character. And that some people are best kept out.
Corporations, being amoral, should also be kept out.
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The old internet was the way it was because of gate keeping - the people on it were selected through technical skill being required. Generally people who are builder types are more pro-social than redistributor types.
Any time I've been in a community which felt good, it was full of people who enjoyed building stuff.
Any time such a community died, it was because people who crave power and status took it over.