So that's not the real grumpycat sending out those phishing comments. Seems like the hackers hijacked his canned message available here and edited it for their own nefarious purposes.

If you see something like this, the best thing to do is to report it to @steemcleaners at https://steemit.chat/channel/steemitabuse so that they can flag the account till 0 rep to hide all its comments. You can also try leaving a downvote on the comment and a reply saying it's a phishing attack, but unless you're using a bot, it's impossible to catch up with them.