That argument could be expanded to any tool though.
People run people over with cars or drive drunk. Ban cars?
People use computers to distribute CP. Ban computers?
People use baseball bats to bludgeon people to death. Ban baseball?
The question of if a tool should be banned is driven by if its utility is outweighed by the negative externalities of use by bad actors.
The answer is wildly more nuanced than “if it can hurt someone it must be banned.”
I loved FFSend. When it died, I ended up standing up a GOKAPI server, as it was the closest alternative I could find at the time: https://github.com/Forceu/Gokapi
Definitely not as nice as FFSend though. I may have to give that fork a try instead.