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Thank you for drawing our attention to this! Our blog content surpassed the RSS limit awhile ago, we are working on paginating the feed so new content fits.
We just updated our RSS feed to only show the most recent 50 blogs so that it fits within the W3C validator size limits. The feed of all blogs is still available at https://www.dolthub.com/blog/rss-all.xml
I can confirm it works now! Thank you so much :)