Misskey/Sharkey being similar to Pinterest??? Has Pinterest changed that much in about 4 years, cause that's when I last used it (ads ad AI art chased me off)
Miss/Sharkey is more like Twitter but if it was pretty/customizable and with a pinch of overstimulation imo. The JP origins is what gives it the overstimulation (the reaction emotes, oh my god...)
I don't really think any popular Fedi platform is similar to Pinterest tbh.