@cliffwade The most immediate change we are making is disabling registrations on newly installed instances, and displaying a banner to state that open registrations require a reactive moderation team. Captcha support has been introduced in 4.2 (in reaction to another abuse wave), but we need to improve it. It was initially intended to be automatically enabled when an abnormal rate of signups was detected, but we did not had time to finish this (see https://github.com/mastodon/mastodon/pull/25032)
@renchap I read that last year when you posted it and I agree, lots of great ideas and thoughts in that post.
I know this is going to be something that we have to deal with and fight at all times basically, which is sad. I just hope to see the sign up process be much better than it is today.
I know captcha can be difficult for disabled people, but I think that's one of many things that will help. Though it hurts in other ways.