@istvan@eriner nevermind im retarded I see you were talking about what they can do to prevent it not what we can do to not see it. OCR is probably the best bet for the specific task which is something misskey has the ability to easily achieve as they already scan media for "NSFW" using AI.
we curbed this by limiting the total amount of times the registration endpoint can be hit in a minute, in an hour, in a day etc as well as limiting amounts per IP, user agent