Yeah, I find that the point is rarely well made and it’s often because the whole argument is a bit confused. People want to present it as being easier than it is.

Open registrations on the fediverse is a problem in general. Trolls abuse it to make accounts specifically to harass specific users. Those not being harassed will not notice this - before the “fetch all replies” feature was introduced they wouldn’t even see the replies. And because it seems so much better than other platforms unless you’re actively being targeted, you’ll have minority women or whatever raising the problem and a bunch of white men will respond that they have no idea what they’re talking about and that there is no problem and that they should just block the trolls. Blocking the trolls is just not efficient if they keep popping up all over the place.

One way to avoid this as a server admin is to defederate instances with open registrations that are being used in this way. But Mastodon.social is too big for this strategy to really be viable.

Of course, open registrations is also key to people bothering signing up in the first place. People are not used to resistance, and they don’t want to write a letter of motivation to sign up for social media. So the issue is not easily solved. Mastodon is working on better moderation tools. Hopefully they’ll manage to address it that way.