It's /a/, my dudes. It's not like it's an organized group going out of their way to step on toes, if some /a/non starts doing chapters out of nowhere like this it's usually just because there's a big plot event coming up and people on /a/ are eager to see what's next without waiting for the regular groups to update. Once the "oh no juliet got found out" arc ends they'll slink back off into the darkness.