The GIF maker is acting up

YouTube links are currently not working; a known issue and Imgflip is working on a fix. In the meantime, you can workaround this by downloading the video and uploading it directly to the gif maker.

My man really took a break from his 2 month break
Maybe I'll download it instead

any word on the fix? It's been a year and STILL an issue

Any word on a fix? This is STILL an issue

Not really. Though this error sometimes alternates between two messages, the one in the image and another one saying:

"Youtube is limiting downloads due to high volume. You can try again later, or try a different video host. If you want to guarantee that a video will work for you, you can always use the slightly slower method of downloading the video to your own computer using a video downloading tool, and then uploading it to Imgflip using the Upload button. NOTE: Upgrading to Imgflip Pro will also ensure video urls work consistently."

It seems like it's imgflip that's intentionally stopping video fetching from YouTube and not YouTube itself, because they say that upgrading to Imgflip Pro will make so that YouTube URL's work consistently, so I'm guessing it's another paywalled feature beacuse of processing costs and yadda yadda, which is sad because it used to be free.

A workaround, like the previous message said is to download the video from YouTube, and uploading that local file to the GIF maker, yeah, annoying...

UPDATE: While it's still Imgflip limiting the downloads, it's apparently because YouTube's lawyers threatened them to limit the downloads, or else they would be sued. Source: a comment in imgflip.com/i/93xtlz (not the most reliable source but maybe...)