the amount of code in existence in languages that support "goto" is mindblowing. I would wager that the majority of developers have encountered it in a code base. even though it's not modern, it's certainly a relevant example for most people
My suspicion is that the majority of developers today haven’t used anything besides JavaScript or Typescript professionally, with maybe a bit of Ruby or Python.
C hasn't supported the Dijkstra's bad version of goto since the last century. Gcc was one of the first to add a verification against it, so if your code compiles on gcc without any "ancient code" flag, it's not there.