"Onebox Assistant", crawl for those previews reliably!

Hi! I recently migrated my forum from vbulletin to discourse. My forum uses a lot of embedded videos from youtube and vimeo. I installed a plugin to avoid getting blocked, and the plugin works fine with youtube, but it doesn’t display the vimeo poster. Only the player on a black background.

On the embed.rocks website, when checking a video from vimeo, I get error 429. I checked in different browsers, with different providers, and the result is the same everywhere.

Is this a problem only for me or is there some kind of system failure?