"The project title has been flagged due to similarity with an existing name. Your submission has been sent for moderator review". Package managers have humans

"The project title has been flagged due to similarity with an existing name. Your submission has been sent for moderator review". Package managers have humans to deal with edge cases (removing malicious packages, investigating package errors, etc.) and this is no different. It wouldn't significantly increase their burden because only a small fraction of package names should require human validation.