Not if you set a PIN no. But I think the next bloke can't use the booth to create a signal account anymore. I don't think we'll run out of booth though considering how rare the use case is ;)

Well, phone booths ain’t getting more ubiquitous for whatever reason either :)

I feel it’s really 5 HN hard core privacy persons who want it. I have 5 booth in walking distance from my home, they can have them =)

Even the one who want it seem not to know about “registration block” and “PIN” concepts in Signal, so I seriously question if they really want it…