> Whereas Mastodon/ActivityPub has some flaws that are going to cause real long-term problems if they're not addressed, e.g. tying accounts to a specific instan

> Whereas Mastodon/ActivityPub has some flaws that are going to cause real long-term problems if they're not addressed, e.g. tying accounts to a specific instance combined with the propensity for instances to ban other entire instances or ban small/new instances by default, which will have the unfortunate propensity for market concentration. I don't think these are problems. Compare it to how email works nowadays, and it's very similar. At least you can easily move your Mastodon account to a new instance and there are built in mechanisms so that you're followers dont even notice your instance has changed, they still keep following you. And good luck running your own email server, you'll also get marked as spam by most. But still, email works and works well. So, no reason for Mastodon not to work.