Because lemmygrad is pretty huge and other instances don’t want their new users to be met with a flood of tankie content, most instances are blocking lemmygrad.
German “Catastrophe” is “Katastrophe”. “Katzastrophe” is “Katze”+“Katastrophe”, which in english would be “cat” + “catastrophe”… oh.
If per-user instance filters are implemented, perhaps instances could have “default blacklists” for new users for stuff like exploding-heads or lemmygrad that most people don’t want to see, with the option to manually un-block them if someone does want to see that.