Pretty much this unless you use a non default UI that adds the alt text as a banner below.
indiealexh
Easiest way I can think of is to build a custom client and a thin moderation queue later that sits on top of the mastodon API.
Likely is a better way but that's what I can think of.
Custom client -> moderation queue api -> mastodon api
Maybe, but who's paying? And why are they releasing it to the public for free?
Companies want to make money. Individuals want to spend as little as they can.
Many Companies are also more recently pushing back against opensource because they can't license how they want to to maximize profit. So there is a few companies who would pay for such a thing and all it opensource but not many and they have other priorities.
Maybe bluesky or whatever will care enough...
The apis exists to perform moderation via a separate application, so in theory automated content moderation is possible, but most servers are relatively small and funding limited. This means there is little motivation to develop or adopt automated moderation.
The primary mechanism of moderation if by excluding people who break rules. Someone on your server breaks a rule, you ban them. They move somewhere else, they break your rules there and the mods over there don't care, so you exclude that instance from your server. (Defederate)
It's a simple but pretty effective system.
I think a kind of spider style bot that can be used to flag instances with high levels of rule breaking to suggest ban lists might be effective, but all automoderation comes with some level of error and we should be wary.
Content warning: instance Meta