NSFW tags are built into Lemmy and therefore it’s possible to turn that off (whether using Boost, another client, or simply the web front-end). There’s no anime tag, so you’re basically asking for some kind of chatgpt-esque automagic detection of your disfavored content to filter it out.

Much easier to either block what you aren’t interested in from all, or curate what you DO want to see via subscribed, no?

I am confident that’s the case - there’s a reason the mobile website is constantly asking you if you’d like to use the app instead… it’s their preferred mode for you to view. Even if it is terrible, it locks you onto Reddit.