According to the reports, it wasn't twitter that was hacked, but it was a human allowing a simswap.

Heh heh! Still embarrassing! The hacker hacked a human instead of an algo/system. :)

Yes, this is a weak link, and it's quite serious as more and more security is placed on a phone number.

Simswaps have become a problem over recent years with bad actors persuading humans they are the genuine owner of the phone number.