The 'Made by a Redditor' label appears when the meme is reposted on Reddit, but the person who created the meme is either anonymous or deleted their account.
I once had a meme that was reposted on Reddit:
imgflip.com/i/5742df
(see the image attached to this comment)
Assuming that I delete my account, the 'Made by a Redditor' label will probably appear.
Responding to the title, I do not think it was deprecated. The same situation happened to my meme, only this time it was not anonymous. My meme is also much newer than the one above, being made only 2 years ago.
