This counts as a dupe because there was a significant discussion just a few months ago:

How SSH port became 22 (2017) - https://qht.co/item?id=39313170 - Feb 2024 (176 comments)

Earlier threads in case anyone's interested:

How SSH got port number 22 - https://qht.co/item?id=33363795 - Oct 2022 (2 comments)

How SSH Port Became 22 - https://qht.co/item?id=21350246 - Oct 2019 (81 comments)

How SSH port became 22 - https://qht.co/item?id=17552100 - July 2018 (95 comments)

How SSH got port number 22 - https://qht.co/item?id=14178091 - April 2017 (207 comments)