Like as a bludgeoning weapon or something? Legally I think this service falls under common carrier protections.

Being somewhat famous and in a public place makes it less than ideal for calling in bomb threats or whatnot.

Users are apparently anonymous -- this will make it non-sustainable. One plausible fix: A video camera that records faces. Otherwise the homeless will be taking a beating from the local drug dealer whenever they get in the way of urgent business.

Like this:

Q. Do Links have cameras and what happens to the footage?

There are two security cameras on each Link.

https://www.link.nyc/faq.html