Yes, but not on forums, however on my website still. If it’s a DM, I ignore it, and ask them to write a well written email if they really want to.
If I receive a email, I check if there’s a valid account with the mail mentioned and simply remove it from everywhere. However, I give them a 1 day period if they change their mind, and also some legal blah blahs about storing and deleting the accounts from the servers (automated) .
After that one day, either there’s a response, or there’s no response. Since there’s no response, according to the email they sent me, I am legally obliged to delete their account, so I just do so. And simply say that I can’t do anything, you asked me for it, I asked for confirmation, you didn’t give a response, I assumed that your decision was final so I deleted it, no if’s and but’s. If they argue, I simply have the proof as in the form of a email.
Remember, there’s a lot of people who do this, ask them to do it in a fully legal procedure, they don’t want to do it suddenly. If it’s in a format that’s fully legal, you basically are required to do so.