I Am Completely Serious

The alternate explanation is no less hilarious: spammers, and people who have employed spam campaigns in the past, are starting to get dinged by Google. So they send these form letters to places that they or their agents have spammed in the past, and any other thing that Google thinks looks like spam intended to promote them.

The Dreamwidth anti-spam team gets a few very sincere letters like this every now and then. Sometimes it's about actual spam which they are now regretting. Sometimes it is about real users having linked to them. If it's not actual spam, they are told to piss up a rope. If it is actual spam, it does tend to disappear, but (depending on the circumstances) they may still be told to piss up a rope.