For goodness sake, it was cited as one of the reasons for the 1812 War!
“You don’t think gangpressing men onto ships isn’t akin to forcing Africans onto ships?”
It’s akin to being “shanghaied”, a term I suspect you know since you are well read. But it doesn’t imply slavery. Slavery is the ownership of human beings. And impressed or shanghaied sailors aren’t owned by anyone.
Moreover gangpressing is something that England did to its own people, and had done for centuries, long before they were involved in slaving.
“The British practice of manning naval ships with “pressed” men, who were forcibly placed into service, was a common one in English history, dating back to medieval times.
“Under British law, the navy had the right, during time of war, to sweep through the streets of Great Britain, essentially arresting men and placing them in the Royal Navy.”
“Legally, foreigners were protected from the press, but this legality was often ignored, and the practice of pressing men at sea became common. In the eyes of the Royal Navy, all Englishmen were available for service even if they were on the ship of a foreign nation. Therefore, it was not uncommon for British naval vessels to stop American ships searching for English crewmen. During these searches, American sailors who could not prove their citizenship were often pressed.”
https://www.marinersmuseum.org/sites/micro/usnavy/08/08a.htm