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This tweet from the official Substack account has zero 'likes':

https://twitter.com/SubstackInc/status/1644409243989155841

"A statement from our founders:

Any platform that benefits from writers’ and creators’ work but doesn’t give them control over their relationships will inevitably wonder how to respond to the platforms that do."

https://twitter.com/SubstackInc/status/1644059805315747844

"We're investigating reports that Twitter embeds and authentication no longer work on Substack. We are actively trying to resolve this and will share updates as additional information becomes available."