As seen at BleepingComputer.com Morse Code is being used in Phishing Scams:
A new targeted phishing campaign includes the novel obfuscation technique of using Morse code to hide malicious URLs in an email attachment.
… Starting last week [beginning of February 2021], a threat actor began utilizing Morse code to hide malicious URLs in their phishing form to bypass secure mail gateways and mail filters.
It is a shame that CW (Morse Code) is being abused to cause mischief.
[The picture came from https://www.historyofinformation.com/detail.php?id=471 which features Alfred Vail’s Description of the American ElectroMagnetic Telegraph: Now in Operation between the Cities of Washington and Baltimore (Washington: Printed by J. & G. S. Gideon,1845)]