If you have a forked nostrudel, aren't you blocking it at a client level? The relays you're connected to are probably still storing the spam if, as you say, the admins aren't doing anything about it.

It's one thing to block on your own personal fork since youre making decisions that impact you alone. But as an admin for a public client, their decisions impact a lot of people. Someone will eventually yell censorship. Reply guy is one thing as it's obvious spam but there's a gradient and where do you draw the line? How do you determine what is spam? Ironically enough, I use amythest and it puts your notes behind a "show anyway" button. 

Blocking at a relay or client level requires an individual to make a unilateral decision for many. Filtering (which is what wot is implementing) is passive and other than setting the intial ruleset, does not require constant maintenece or decision making from the admin. This is probably why relay admins are weary of implementing nip05 blocking and devs are looking into wot.